diff --git a/src/NodaTimeAutotranslater.php b/src/NodaTimeAutotranslater.php
index 9789dbb..3fdf2df 100644
--- a/src/NodaTimeAutotranslater.php
+++ b/src/NodaTimeAutotranslater.php
@@ -378,33 +378,33 @@ final class NodaTimeAutotranslater {
             return self::TRANSLATABLE_UNTIL_END;
         }
 
-        if (intval($zeit_ende) >= 0 && intval($zeit_beginn) < 0) {
+        if (\intval($zeit_ende) >= 0 && \intval($zeit_beginn) < 0) {
             return self::TRANSLATABLE_NOT;
         }
 
-        if (($zeit_ende > 0 && intval($zeit_ende) % 100 === 0 and (intval($zeit_beginn) - 1) % 100 === 0)
-            || (intval($zeit_beginn) < 0 && intval($zeit_beginn) % 100 === 0 and (intval($zeit_ende) + 1) % 100 === 0)
+        if (($zeit_ende > 0 && \intval($zeit_ende) % 100 === 0 and (\intval($zeit_beginn) - 1) % 100 === 0)
+            || (\intval($zeit_beginn) < 0 && \intval($zeit_beginn) % 100 === 0 and (\intval($zeit_ende) + 1) % 100 === 0)
         ) {
             return self::TRANSLATABLE_CENTURY;
         }
 
-        if ((intval($zeit_ende) + 1) % 10 === 0 and intval($zeit_beginn) % 10 === 0 and intval($zeit_beginn) > 1000) {
+        if ((\intval($zeit_ende) + 1) % 10 === 0 and \intval($zeit_beginn) % 10 === 0 and \intval($zeit_beginn) > 1000) {
             return self::TRANSLATABLE_DECADE;
         }
 
-        if (intval($zeit_ende) < 0 && intval($zeit_beginn) < 0
-            || (intval($zeit_ende) < 1000 and trim($zeit_zaehlzeit_monat, ", .0") === "")
+        if (\intval($zeit_ende) < 0 && \intval($zeit_beginn) < 0
+            || (\intval($zeit_ende) < 1000 and \trim($zeit_zaehlzeit_monat, ", .0") === "")
         ) {
             return self::TRANSLATABLE_AS_YEAR_WITH_SUFFIX;
         }
-        if ($zeit_ende === $zeit_beginn and trim($zeit_zaehlzeit_monat, ", .0") === "") {
+        if ($zeit_ende === $zeit_beginn and \trim($zeit_zaehlzeit_monat, ", .0") === "") {
             return self::TRANSLATABLE_ONLY_YEAR;
         }
-        if ($zeit_ende !== $zeit_beginn and trim($zeit_zaehlzeit_monat, ", .0") === "") {
+        if ($zeit_ende !== $zeit_beginn and \trim($zeit_zaehlzeit_monat, ", .0") === "") {
             return self::TRANSLATABLE_TIMESPAN_YEARS;
         }
         // Conditions speaking against translatability.
-        if (trim($zeit_zaehlzeit_monat, ", .0") === "") {
+        if (\trim($zeit_zaehlzeit_monat, ", .0") === "") {
             return self::TRANSLATABLE_NOT;
         }
 
@@ -449,9 +449,9 @@ final class NodaTimeAutotranslater {
         case 0:
             return $timeName;
         case 1:
-            return sprintf(self::LANGS_TO_CE_FORMAT[$tLang], $timeName);
+            return \sprintf(self::LANGS_TO_CE_FORMAT[$tLang], $timeName);
         case 2:
-            return sprintf(self::LANGS_TO_BCE_FORMAT[$tLang], $timeName);
+            return \sprintf(self::LANGS_TO_BCE_FORMAT[$tLang], $timeName);
         default:
             throw new Exception("Unknown case encountered for time translations.");
         }
@@ -467,16 +467,16 @@ final class NodaTimeAutotranslater {
      */
     public static function translateYearsWithSuffix(array $timeInfo):array {
 
-        $start = intval($timeInfo['zeit_beginn']);
-        $end = intval($timeInfo['zeit_ende']);
+        $start = \intval($timeInfo['zeit_beginn']);
+        $end = \intval($timeInfo['zeit_ende']);
 
         $suffixMode = self::getSuffixModeForYearsWSuffix($start, $end);
 
         // Time info to pass
         if ($suffixMode === 2) {
             $timeInfoToCopy = $timeInfo;
-            $timeInfoToCopy["zeit_beginn"] = abs($start);
-            $timeInfoToCopy["zeit_ende"] = abs($end);
+            $timeInfoToCopy["zeit_beginn"] = \abs($start);
+            $timeInfoToCopy["zeit_ende"] = \abs($end);
         }
 
         $output = [];
@@ -495,9 +495,9 @@ final class NodaTimeAutotranslater {
             }
             else {
                 if ($start === $end) {
-                    $year = sprintf(self::LANGS_SINGLE_YEAR_FORMAT[$tLang], (string)abs($start));
+                    $year = \sprintf(self::LANGS_SINGLE_YEAR_FORMAT[$tLang], (string)\abs($start));
                 }
-                else $year = sprintf(self::LANGS_YEARSPAN_FORMAT[$tLang], (string)abs($start), (string)abs($end));
+                else $year = \sprintf(self::LANGS_YEARSPAN_FORMAT[$tLang], (string)\abs($start), (string)\abs($end));
             }
 
             $output[$tLang] = self::applyBcBceFormat($tLang, $year, $suffixMode);
@@ -516,11 +516,11 @@ final class NodaTimeAutotranslater {
      */
     public static function translateYearOnly(array $timeInfo):array {
 
-        $start = intval($timeInfo['zeit_beginn']);
+        $start = \intval($timeInfo['zeit_beginn']);
         $output = [];
 
         foreach (self::LANGS_SINGLE_YEAR_FORMAT as $tLang => $format) {
-            $output[$tLang] = sprintf($format, (string)abs($start));
+            $output[$tLang] = \sprintf($format, (string)\abs($start));
         }
         return $output;
 
@@ -535,13 +535,13 @@ final class NodaTimeAutotranslater {
      */
     public static function translateTimespanYears(array $timeInfo):array {
 
-        $start = intval($timeInfo['zeit_beginn']);
-        $end = intval($timeInfo['zeit_ende']);
+        $start = \intval($timeInfo['zeit_beginn']);
+        $end = \intval($timeInfo['zeit_ende']);
         $output = [];
 
-        if (abs($start) === 1102) throw new Exception(var_export($timeInfo, true));
+        if (\abs($start) === 1102) throw new Exception(var_export($timeInfo, true));
         foreach (self::LANGS_YEARSPAN_FORMAT as $tLang => $format) {
-            $output[$tLang] = sprintf($format, (string)abs($start), (string)abs($end));
+            $output[$tLang] = \sprintf($format, (string)\abs($start), (string)\abs($end));
         }
         return $output;
 
@@ -556,32 +556,32 @@ final class NodaTimeAutotranslater {
      */
     public static function translateYearsAsCentury(array $timeInfo):array {
 
-        if (intval($timeInfo['zeit_beginn']) > 0) {
+        if (\intval($timeInfo['zeit_beginn']) > 0) {
             // Beginn: 1500. (1501 - 1) / 100 + 1 = 16. 16th century is the time.
-            $start_cen = ((intval($timeInfo['zeit_beginn']) - 1) / 100) + 1;
+            $start_cen = ((\intval($timeInfo['zeit_beginn']) - 1) / 100) + 1;
             // End: 1600. 16th century is the time.
-            $end_cen = (intval($timeInfo['zeit_ende']) / 100);
+            $end_cen = (\intval($timeInfo['zeit_ende']) / 100);
         }
         else {
             // End: -1600. 16th century is the time.
-            $start_cen = (intval($timeInfo['zeit_beginn']) / 100);
+            $start_cen = (\intval($timeInfo['zeit_beginn']) / 100);
             // End: -1500. (1501 - 1) / 100 + 1 = 16. 16th century is the time.
-            $end_cen = ((intval($timeInfo['zeit_ende']) + 1) / 100) - 1;
+            $end_cen = ((\intval($timeInfo['zeit_ende']) + 1) / 100) - 1;
         }
 
-        $suffixMode = self::getSuffixModeForYearsWSuffix((intval($timeInfo['zeit_beginn']) - 1), intval($timeInfo['zeit_ende']));
+        $suffixMode = self::getSuffixModeForYearsWSuffix((\intval($timeInfo['zeit_beginn']) - 1), \intval($timeInfo['zeit_ende']));
 
         $output = [];
 
         if ($start_cen === $end_cen) {
             foreach (self::LANGS_CENTURY_FORMAT as $tLang => $format) {
-                $tLangValue = sprintf($format, (string)abs($start_cen));
+                $tLangValue = \sprintf($format, (string)\abs($start_cen));
                 $output[$tLang] = self::applyBcBceFormat($tLang, $tLangValue, $suffixMode);
             }
         }
         else {
             foreach (self::LANGS_CENTURIES_FORMAT as $tLang => $format) {
-                $tLangValue = sprintf($format, (string)abs($start_cen), (string)abs($end_cen));
+                $tLangValue = \sprintf($format, (string)\abs($start_cen), (string)\abs($end_cen));
                 $output[$tLang] = self::applyBcBceFormat($tLang, $tLangValue, $suffixMode);
             }
         }
@@ -599,25 +599,25 @@ final class NodaTimeAutotranslater {
     public static function translateYearsAsDecade(array $timeInfo):array {
 
         // Beginn: 1500. (1501 - 1) / 100 + 1 = 16. 16th century is the time.
-        $start_cen = (intval($timeInfo['zeit_beginn']));
+        $start_cen = (\intval($timeInfo['zeit_beginn']));
         // End: 1600. 16th century is the time.
-        $end_cen = (intval($timeInfo['zeit_ende']));
+        $end_cen = (\intval($timeInfo['zeit_ende']));
 
-        $suffixMode = self::getSuffixModeForYearsWSuffix((intval($timeInfo['zeit_beginn']) - 1), intval($timeInfo['zeit_ende']));
+        $suffixMode = self::getSuffixModeForYearsWSuffix((\intval($timeInfo['zeit_beginn']) - 1), \intval($timeInfo['zeit_ende']));
 
         $output = [];
 
         if ($start_cen === $end_cen - 9) {
             foreach (self::LANGS_DECADE_FORMAT as $tLang => $format) {
-                $tLangValue = sprintf($format, (string)$start_cen, (string)$end_cen);
-                if (!empty(self::LANGS_SYLLABLE_CLEANING[$tLang])) $tLangValue = strtr($tLangValue, self::LANGS_SYLLABLE_CLEANING[$tLang]);
+                $tLangValue = \sprintf($format, (string)$start_cen, (string)$end_cen);
+                if (!empty(self::LANGS_SYLLABLE_CLEANING[$tLang])) $tLangValue = \strtr($tLangValue, self::LANGS_SYLLABLE_CLEANING[$tLang]);
                 $output[$tLang] = self::applyBcBceFormat($tLang, $tLangValue, $suffixMode);
             }
         }
         else {
             foreach (self::LANGS_DECADES_FORMAT as $tLang => $format) {
-                $tLangValue = sprintf($format, (string)$start_cen, (string)($end_cen - 9));
-                if (!empty(self::LANGS_SYLLABLE_CLEANING[$tLang])) $tLangValue = strtr($tLangValue, self::LANGS_SYLLABLE_CLEANING[$tLang]);
+                $tLangValue = \sprintf($format, (string)$start_cen, (string)($end_cen - 9));
+                if (!empty(self::LANGS_SYLLABLE_CLEANING[$tLang])) $tLangValue = \strtr($tLangValue, self::LANGS_SYLLABLE_CLEANING[$tLang]);
                 $output[$tLang] = self::applyBcBceFormat($tLang, $tLangValue, $suffixMode);
             }
         }
@@ -634,8 +634,8 @@ final class NodaTimeAutotranslater {
      */
     public static function translateYearsAfterStart(array $timeInfo):array {
 
-        if (empty(trim((string)$timeInfo['zeit_zaehlzeit_monat'], " ,.;0"))) {
-            $timeInfo['zeit_beginn'] = strval(intval($timeInfo['zeit_beginn']) - 1);
+        if (empty(\trim((string)$timeInfo['zeit_zaehlzeit_monat'], " ,.;0"))) {
+            $timeInfo['zeit_beginn'] = \strval(\intval($timeInfo['zeit_beginn']) - 1);
         }
         # else throw new Exception("Unhandled split case. Counting time is: " . var_export($timeInfo, true));
         $innerTimeInfo = $timeInfo;
@@ -646,7 +646,7 @@ final class NodaTimeAutotranslater {
 
             $dateAlone = self::getTranslations($innerTimeInfo)[$tLang];
 
-            $timeName = sprintf($format, $dateAlone);
+            $timeName = \sprintf($format, $dateAlone);
             $output[$tLang] = $timeName;
 
         }
@@ -663,7 +663,7 @@ final class NodaTimeAutotranslater {
      */
     public static function translateYearsSinceStart(array $timeInfo):array {
 
-        $start = intval($timeInfo['zeit_beginn']);
+        $start = \intval($timeInfo['zeit_beginn']);
 
         if (substr((string)$timeInfo['zeit_name'], 0, 5) === "Nach ") {
             return self::translateYearsAfterStart($timeInfo);
@@ -677,7 +677,7 @@ final class NodaTimeAutotranslater {
 
             $dateAlone = self::getTranslations($innerTimeInfo)[$tLang];
 
-            $timeName = sprintf($format, $dateAlone);
+            $timeName = \sprintf($format, $dateAlone);
             $output[$tLang] = $timeName;
 
         }
@@ -694,10 +694,10 @@ final class NodaTimeAutotranslater {
      */
     public static function translateYearsBeforeEnd(array $timeInfo):array {
 
-        if (empty(trim((string)$timeInfo['zeit_zaehlzeit_monat'], " ,.;0"))) {
-            $timeInfo['zeit_ende'] = strval(intval($timeInfo['zeit_ende']) + 1);
+        if (empty(\trim((string)$timeInfo['zeit_zaehlzeit_monat'], " ,.;0"))) {
+            $timeInfo['zeit_ende'] = \strval(\intval($timeInfo['zeit_ende']) + 1);
         }
-        $end = intval($timeInfo['zeit_ende']);
+        $end = \intval($timeInfo['zeit_ende']);
 
         $innerTimeInfo = $timeInfo;
         $innerTimeInfo['zeit_beginn'] = $timeInfo['zeit_ende'];
@@ -707,7 +707,7 @@ final class NodaTimeAutotranslater {
 
             $dateAlone = self::getTranslations($innerTimeInfo)[$tLang];
 
-            $timeName = sprintf($format, $dateAlone);
+            $timeName = \sprintf($format, $dateAlone);
             $output[$tLang] = $timeName;
         }
         return $output;
@@ -723,7 +723,7 @@ final class NodaTimeAutotranslater {
      */
     public static function translateYearsUntilEnd(array $timeInfo):array {
 
-        $end = intval($timeInfo['zeit_ende']);
+        $end = \intval($timeInfo['zeit_ende']);
 
         if (substr((string)$timeInfo['zeit_name'], 0, 4) === "Vor ") {
             return self::translateYearsBeforeEnd($timeInfo);
@@ -737,7 +737,7 @@ final class NodaTimeAutotranslater {
 
             $dateAlone = self::getTranslations($innerTimeInfo)[$tLang];
 
-            $timeName = sprintf($format, $dateAlone);
+            $timeName = \sprintf($format, $dateAlone);
             $output[$tLang] = $timeName;
         }
         return $output;
@@ -785,9 +785,9 @@ final class NodaTimeAutotranslater {
             return self::translateYearsWithSuffix($timeInfo);
         }
 
-        $suffixMode = self::getSuffixModeForYearsWSuffix((intval($timeInfo['zeit_beginn']) - 1), intval($timeInfo['zeit_ende']));
+        $suffixMode = self::getSuffixModeForYearsWSuffix((\intval($timeInfo['zeit_beginn']) - 1), \intval($timeInfo['zeit_ende']));
 
-        if (trim((string)$timeInfo['zeit_zaehlzeit_tag'], ", .0") === "") {
+        if (\trim((string)$timeInfo['zeit_zaehlzeit_tag'], ", .0") === "") {
             $dateStr = "{$timeInfo['zeit_zaehlzeit_jahr']}-{$timeInfo['zeit_zaehlzeit_monat']}-05 00:00:01";
             $usecase = self::USECASE_MONTH;
         }
@@ -796,16 +796,16 @@ final class NodaTimeAutotranslater {
             $usecase = self::USECASE_DAY;
         }
 
-        $dateGeneral = strtotime($dateStr);
+        $dateGeneral = \strtotime($dateStr);
 
         $output = [];
         foreach (self::LANGS_TO_LOCALES as $tLang => $locale) {
 
-            setlocale(LC_TIME, $locale);
-            if ($locale !== setlocale(LC_TIME, "0")) continue;
-            if ($usecase === self::USECASE_MONTH)    $tLangValue = strftime(getMonthFormatByLang($tLang), $dateGeneral ?: 0);
+            \setlocale(LC_TIME, $locale);
+            if ($locale !== \setlocale(LC_TIME, "0")) continue;
+            if ($usecase === self::USECASE_MONTH)    $tLangValue = \strftime(getMonthFormatByLang($tLang), $dateGeneral ?: 0);
             else { # if ($usecase === self::USECASE_DAY)
-                $tLangValue = strftime(getDateFormatByLang($tLang), $dateGeneral ?: 0);
+                $tLangValue = \strftime(getDateFormatByLang($tLang), $dateGeneral ?: 0);
             }
 
             $output[$tLang] = self::applyBcBceFormat($tLang, $tLangValue, $suffixMode);
diff --git a/src/NodaTimeSplitter.php b/src/NodaTimeSplitter.php
index 87ca9b9..30426c5 100644
--- a/src/NodaTimeSplitter.php
+++ b/src/NodaTimeSplitter.php
@@ -123,15 +123,15 @@ final class NodaTimeSplitter {
      */
     private static function clean_input(string $input):string {
 
-        while (strpos($input, " -") !== false) $input = str_replace(" -", "-", $input);
-        while (strpos($input, "- ") !== false) $input = str_replace("- ", "-", $input);
-        $input = strtr($input, self::STRINGS_TO_CLEAN);
+        while (\strpos($input, " -") !== false) $input = \str_replace(" -", "-", $input);
+        while (\strpos($input, "- ") !== false) $input = \str_replace("- ", "-", $input);
+        $input = \strtr($input, self::STRINGS_TO_CLEAN);
         foreach (self::STRINGS_TO_CLEAN_START as $toCleanFrom => $toCleanTo) {
             if (strpos($input, $toCleanFrom) === 0) {
-                $input = str_replace($toCleanFrom, $toCleanTo, $input);
+                $input = \str_replace($toCleanFrom, $toCleanTo, $input);
             }
         }
-        while (strpos($input, "..") !== false) $input = str_replace("..", ".", $input);
+        while (strpos($input, "..") !== false) $input = \str_replace("..", ".", $input);
 
         return trim($input, ", [](){}");
 
@@ -146,9 +146,9 @@ final class NodaTimeSplitter {
      */
     private static function is_numeric(string $input):bool {
 
-        if (is_numeric($input)
-            and strpos($input, " ") === false
-            and strpos($input, ".") === false
+        if (\is_numeric($input)
+            and \strpos($input, " ") === false
+            and \strpos($input, ".") === false
         ) {
             return true;
         }
@@ -169,12 +169,12 @@ final class NodaTimeSplitter {
     private static function validateDateSubstr(string $datum, int $start, int $end = 10000):string {
 
         if ($start !== 0
-            && !in_array(substr($datum, $start - 1, 1), ["-", " ", "."], true)
+            && !\in_array(\substr($datum, $start - 1, 1), ["-", " ", "."], true)
         ) {
             return "";
         }
 
-        $output = substr($datum, $start, $end);
+        $output = \substr($datum, $start, $end);
         if (self::is_numeric($output)) return $output;
         return "";
 
@@ -190,12 +190,12 @@ final class NodaTimeSplitter {
     public static function timePartsToTimeName(array $moda):string {
 
         if (!empty($moda[5]) and $moda[5] === "Vor" and $moda[0] === "?") {
-            if (empty(trim($moda[2], "0 "))) $moda[1] = strval(intval($moda[1]) + 1);
+            if (empty(trim($moda[2], "0 "))) $moda[1] = \strval(\intval($moda[1]) + 1);
             $moda[0] = $moda[1];
             $prefix = "Vor ";
         }
         else if (!empty($moda[5]) and $moda[5] === "Nach" and $moda[1] === "?") {
-            if (empty(trim($moda[2], "0 "))) $moda[0] = strval(intval($moda[0]) - 1);
+            if (empty(trim($moda[2], "0 "))) $moda[0] = \strval(\intval($moda[0]) - 1);
             $moda[1] = $moda[0];
             $prefix = "Nach ";
         }
@@ -209,8 +209,8 @@ final class NodaTimeSplitter {
         }
         else $prefix = "";
 
-        $moda[0] = intval($moda[0]);
-        $moda[1] = intval($moda[1]);
+        $moda[0] = \intval($moda[0]);
+        $moda[1] = \intval($moda[1]);
 
         if ($moda[0] < 0 && $moda[1] < 0) {
             $suffix = " v. Chr.";
@@ -220,13 +220,13 @@ final class NodaTimeSplitter {
         }
         else $suffix = "";
 
-        $moda[0] = abs($moda[0]);
-        $moda[1] = abs($moda[1]);
+        $moda[0] = \abs($moda[0]);
+        $moda[1] = \abs($moda[1]);
 
         if ($moda[0] !== $moda[1]) {
             return "{$prefix}{$moda[0]}-{$moda[1]}{$suffix}";
         }
-        else if (intval($moda[2]) !== 0 and intval($moda[3]) !== 0) {
+        else if (\intval($moda[2]) !== 0 and \intval($moda[3]) !== 0) {
             return "{$prefix}{$moda[3]}.{$moda[2]}.{$moda[0]}{$suffix}";
         }
         else if ($moda[0] === $moda[1] && trim((string)$moda[2], " 0") === "" && trim((string)$moda[3], " 0") === "") {
@@ -252,19 +252,19 @@ final class NodaTimeSplitter {
 
         if ($moda[0] === "?") {
             if (!empty($moda[5]) and $moda[5] === "Vor" and empty(trim($moda[2], " 0"))) {
-                return abs(intval($moda[1])) + 1;
+                return \abs(\intval($moda[1])) + 1;
             }
-            return abs(intval($moda[1]));
+            return \abs(\intval($moda[1]));
         }
 
         if ($moda[1] === "?") {
             if (!empty($moda[5]) and $moda[5] === "Nach" and empty(trim($moda[2], " 0"))) {
-                return abs(intval($moda[0])) - 1;
+                return \abs(\intval($moda[0])) - 1;
             }
-            return abs(intval($moda[0]));
+            return \abs(\intval($moda[0]));
         }
 
-        return abs((int)ceil(intval($moda[1]) - ((intval($moda[1]) - intval($moda[0])) / 2)));
+        return \abs((int)\ceil(\intval($moda[1]) - ((\intval($moda[1]) - \intval($moda[0])) / 2)));
 
     }
 
@@ -335,7 +335,7 @@ final class NodaTimeSplitter {
      */
     public static function pad_to_four(string $input):string {
 
-        return substr("0000" . $input, -4);
+        return \substr("0000" . $input, -4);
 
     }
 
@@ -348,7 +348,7 @@ final class NodaTimeSplitter {
      */
     public static function pad_to_two(string $input):string {
 
-        return substr("00" . $input, -2);
+        return \substr("00" . $input, -2);
 
     }
 
@@ -363,11 +363,11 @@ final class NodaTimeSplitter {
 
         $datum = self::clean_input($datum);
 
-        if (preg_match("/\ v\.\ Chr\.$/", $datum)) {
-            if ($output = self::attempt_splitting(substr($datum, 0, -8))) {
-                $start = strval(-1 * intval($output[1]));
-                $end = strval(-1 * intval($output[0]));
-                if (intval($start) > intval($end)) {
+        if (\preg_match("/\ v\.\ Chr\.$/", $datum)) {
+            if ($output = self::attempt_splitting(\substr($datum, 0, -8))) {
+                $start = \strval(-1 * \intval($output[1]));
+                $end = \strval(-1 * \intval($output[0]));
+                if (\intval($start) > \intval($end)) {
                     $startToSet = $end;
                     $end = $start;
                     $start = $startToSet;
@@ -376,7 +376,7 @@ final class NodaTimeSplitter {
             }
         }
 
-        $datum = str_replace(". ", ".", $datum);
+        $datum = \str_replace(". ", ".", $datum);
 
         if (self::stri_occurs($datum, self::STOP_STRINGS_GERMAN)) {
             return [];
@@ -393,12 +393,12 @@ final class NodaTimeSplitter {
             }
         }
 
-        if (empty($monat) and self::is_numeric((string)substr($datum, 3, 2))) $monat = substr($datum, 3, 2);
+        if (empty($monat) and self::is_numeric((string)\substr($datum, 3, 2))) $monat = \substr($datum, 3, 2);
 
-        if (self::is_numeric((string)substr($datum, 0, 2))) $day = substr($datum, 0, 2);
-        else if (substr($datum, 1, 1) === "." and self::is_numeric((string)substr($datum, 0, 1))) $day = "0" . substr($datum, 0, 1);
+        if (self::is_numeric((string)\substr($datum, 0, 2))) $day = \substr($datum, 0, 2);
+        else if (\substr($datum, 1, 1) === "." and self::is_numeric((string)\substr($datum, 0, 1))) $day = "0" . \substr($datum, 0, 1);
 
-        if (self::is_numeric((string)substr($datum, -4))) $year = substr($datum, -4);
+        if (self::is_numeric((string)\substr($datum, -4))) $year = \substr($datum, -4);
 
         if (!empty($year) and !empty($monat) and !empty($day) and $use_day) {
             return [$year, $year, $monat, $day, '+', ""];
@@ -421,11 +421,11 @@ final class NodaTimeSplitter {
 
         $datum = self::clean_input($datum);
 
-        if (preg_match("/^Kr\.\ e\.\ /", $datum)) {
-            if ($output = self::attempt_splitting(substr($datum, 7))) {
-                $start = strval(-1 * intval($output[1]));
-                $end = strval(-1 * intval($output[0]));
-                if (intval($start) > intval($end)) {
+        if (\preg_match("/^Kr\.\ e\.\ /", $datum)) {
+            if ($output = self::attempt_splitting(\substr($datum, 7))) {
+                $start = \strval(-1 * \intval($output[1]));
+                $end = \strval(-1 * \intval($output[0]));
+                if (\intval($start) > \intval($end)) {
                     $startToSet = $end;
                     $end = $start;
                     $start = $startToSet;
@@ -434,9 +434,9 @@ final class NodaTimeSplitter {
             }
         }
 
-        if (preg_match("/^[0-9][0-9][0-9][0-9]\-t(ő|ó)l(\ |\-)[0-9][0-9][0-9][0-9]\-ig$/", $datum)) {
-            $start = substr($datum, 0, 4);
-            $end = substr($datum, -7, 4);
+        if (\preg_match("/^[0-9][0-9][0-9][0-9]\-t(ő|ó)l(\ |\-)[0-9][0-9][0-9][0-9]\-ig$/", $datum)) {
+            $start = \substr($datum, 0, 4);
+            $end = \substr($datum, -7, 4);
             return [$start, $end, "00", "00", "+", ""];
         }
 
@@ -453,8 +453,8 @@ final class NodaTimeSplitter {
             }
         }
 
-        if (empty($monat) and self::is_numeric((string)substr($datum, 5, 2))) $monat = substr($datum, 5, 2);
-        else if (empty($monat) and self::is_numeric((string)substr($datum, 6, 2))) $monat = substr($datum, 6, 2);
+        if (empty($monat) and self::is_numeric((string)\substr($datum, 5, 2))) $monat = \substr($datum, 5, 2);
+        else if (empty($monat) and self::is_numeric((string)\substr($datum, 6, 2))) $monat = \substr($datum, 6, 2);
 
         $day = self::validateDateSubstr($datum, -2);
         if (empty($day)) $day = self::validateDateSubstr($datum, -3, 2);
@@ -462,14 +462,14 @@ final class NodaTimeSplitter {
         if (empty($day)) $day = self::validateDateSubstr($datum, -5, 2);
         if (empty($day)) $day = self::validateDateSubstr($datum, -6, 2);
 
-        if (substr($datum, -2, 1) === " " and self::is_numeric((string)substr($datum, -1, 1))) {
-            $day = "0" . substr($datum, -1, 1);
+        if (\substr($datum, -2, 1) === " " and self::is_numeric((string)\substr($datum, -1, 1))) {
+            $day = "0" . \substr($datum, -1, 1);
         }
-        else if ((empty($day)) and substr($datum, -3, 1) === " " and self::is_numeric((string)substr($datum, -2, 1))) {
-            $day = "0" . substr($datum, -2, 1);
+        else if ((empty($day)) and \substr($datum, -3, 1) === " " and self::is_numeric((string)\substr($datum, -2, 1))) {
+            $day = "0" . \substr($datum, -2, 1);
         }
 
-        if (self::is_numeric((string)substr($datum, 0, 4))) $year = substr($datum, 0, 4);
+        if (self::is_numeric((string)\substr($datum, 0, 4))) $year = \substr($datum, 0, 4);
 
         if (!empty($year) and !empty($monat) and !empty($day)) {
             return [$year, $year, $monat, $day, '+', ""];
@@ -492,11 +492,11 @@ final class NodaTimeSplitter {
 
         $datum = self::clean_input($datum);
 
-        if (!($timeInt = strtotime($datum))) {
+        if (!($timeInt = \strtotime($datum))) {
             return [];
         }
 
-        return [date("Y", $timeInt), date("m", $timeInt), date("d", $timeInt), '+', ""];
+        return [\date("Y", $timeInt), \date("m", $timeInt), \date("d", $timeInt), '+', ""];
 
     }
 
@@ -512,64 +512,64 @@ final class NodaTimeSplitter {
         $datum = self::clean_input($datum);
 
         // 10000-20000
-        if (!empty(preg_match("/^[0-9]{5}(\-|\/)[0-9]{5}$/", $datum))) {
-            $start = substr($datum, 0, 5);
-            $end = substr($datum, 6, 5);
+        if (!empty(\preg_match("/^[0-9]{5}(\-|\/)[0-9]{5}$/", $datum))) {
+            $start = \substr($datum, 0, 5);
+            $end = \substr($datum, 6, 5);
             return [$start, $end, "00", "00", "+", ""];
         }
 
         // 0000-0000
-        if (preg_match("/^[0-9]{4}(\-|\/)[0-9]{4}(\.|)$/", $datum)) {
-            $start = substr($datum, 0, 4);
-            $end = substr($datum, 5, 4);
+        if (\preg_match("/^[0-9]{4}(\-|\/)[0-9]{4}(\.|)$/", $datum)) {
+            $start = \substr($datum, 0, 4);
+            $end = \substr($datum, 5, 4);
             return [$start, $end, "00", "00", "+", ""];
         }
 
-        if (preg_match("/^[0-9]\.[0-9][0-9][0-9](\-|\/)[0-9]\.[0-9][0-9][0-9]$/", $datum)) {
-            $datum = str_replace(".", "", $datum);
-            $start = substr($datum, 0, 4);
-            $end = substr($datum, 5, 4);
+        if (\preg_match("/^[0-9]\.[0-9][0-9][0-9](\-|\/)[0-9]\.[0-9][0-9][0-9]$/", $datum)) {
+            $datum = \str_replace(".", "", $datum);
+            $start = \substr($datum, 0, 4);
+            $end = \substr($datum, 5, 4);
             return [$start, $end, "00", "00", "+", ""];
         }
 
         // German TT.MM.JJJJ  /  TT.MM.JJJ  /  TT.MM.JJ  /  TT.MM.J
-        if (preg_match("/^[0-9][0-9]\.[0-9][0-9]\.([0-9][0-9][0-9][0-9]|[0-9][0-9][0-9]|[0-9][0-9]|[0-9])$/", $datum)) { // German T.MM.JJJJ
-            $start = substr($datum, 6, 4);
-            $month = substr($datum, 3, 2);
-            $day   = substr($datum, 0, 2);
+        if (\preg_match("/^[0-9][0-9]\.[0-9][0-9]\.([0-9][0-9][0-9][0-9]|[0-9][0-9][0-9]|[0-9][0-9]|[0-9])$/", $datum)) { // German T.MM.JJJJ
+            $start = \substr($datum, 6, 4);
+            $month = \substr($datum, 3, 2);
+            $day   = \substr($datum, 0, 2);
             return [$start, $start, $month, $day, "+", ""];
         }
 
         // German TT.M.JJJJ  /  TT.M.JJJ  /  TT.M.JJ  /  TT.M.J
-        if (preg_match("/^[0-9][0-9]\.[0-9]\.([0-9][0-9][0-9][0-9]|[0-9][0-9][0-9]|[0-9][0-9]|[0-9])$/", $datum)) { // German T.MM.JJJJ
-            $start = substr($datum, 5, 4);
-            $month = "0" . substr($datum, 3, 1);
-            $day   = substr($datum, 0, 2);
+        if (\preg_match("/^[0-9][0-9]\.[0-9]\.([0-9][0-9][0-9][0-9]|[0-9][0-9][0-9]|[0-9][0-9]|[0-9])$/", $datum)) { // German T.MM.JJJJ
+            $start = \substr($datum, 5, 4);
+            $month = "0" . \substr($datum, 3, 1);
+            $day   = \substr($datum, 0, 2);
             return [$start, $start, $month, $day, "+", ""];
         }
 
         // German T.MM.JJJJ  /  T.MM.JJJ  /  T.MM.JJ  /  T.MM.J
-        if (preg_match("/^[0-9]\.[0-9][0-9]\.([0-9][0-9][0-9][0-9]|[0-9][0-9][0-9]|[0-9][0-9]|[0-9])$/", $datum)) {
-            $start = substr($datum, 5, 4);
-            $month = substr($datum, 2, 2);
-            $day   = "0" . substr($datum, 0, 1);
+        if (\preg_match("/^[0-9]\.[0-9][0-9]\.([0-9][0-9][0-9][0-9]|[0-9][0-9][0-9]|[0-9][0-9]|[0-9])$/", $datum)) {
+            $start = \substr($datum, 5, 4);
+            $month = \substr($datum, 2, 2);
+            $day   = "0" . \substr($datum, 0, 1);
             return [$start, $start, $month, $day, "+", ""];
         }
 
         // German T.M.JJJJ  /  T.M.JJJ  /  T.M.JJ  /  T.M.J
-        if (preg_match("/^[0-9]\.[0-9]\.([0-9][0-9][0-9][0-9]|[0-9][0-9][0-9]|[0-9][0-9]|[0-9])$/", $datum)) {
-            $start = substr($datum, 4, 4);
-            $month = "0" . substr($datum, 2, 1);
-            $day   = "0" . substr($datum, 0, 1);
+        if (\preg_match("/^[0-9]\.[0-9]\.([0-9][0-9][0-9][0-9]|[0-9][0-9][0-9]|[0-9][0-9]|[0-9])$/", $datum)) {
+            $start = \substr($datum, 4, 4);
+            $month = "0" . \substr($datum, 2, 1);
+            $day   = "0" . \substr($datum, 0, 1);
             return [$start, $start, $month, $day, "+", ""];
         }
 
         // Intl': 2020-12-20
-        if (preg_match("/^[0-9]{4}\-[0-9]{2}\-[0-9]{2}$/", $datum)) { // German Y-m
-            $start = substr($datum, 0, 4);
-            $month = substr($datum, 5, 2);
-            if (intval($month) < 13) {
-                $day   = substr($datum, 8, 2);
+        if (\preg_match("/^[0-9]{4}\-[0-9]{2}\-[0-9]{2}$/", $datum)) { // German Y-m
+            $start = \substr($datum, 0, 4);
+            $month = \substr($datum, 5, 2);
+            if (\intval($month) < 13) {
+                $day   = \substr($datum, 8, 2);
                 return [$start, $start, $month, $day, "+", ""];
             }
             else {
@@ -577,10 +577,10 @@ final class NodaTimeSplitter {
             }
         }
         // Intl': 2020-12
-        if (preg_match("/^[0-9]{4}\-[0-9]{2}$/", $datum)) { // German Y-m
-            $start = substr($datum, 0, 4);
-            $month = substr($datum, 5, 2);
-            if (intval($month) < 13) {
+        if (\preg_match("/^[0-9]{4}\-[0-9]{2}$/", $datum)) { // German Y-m
+            $start = \substr($datum, 0, 4);
+            $month = \substr($datum, 5, 2);
+            if (\intval($month) < 13) {
                 return [$start, $start, $month, "00", "+", ""];
             }
             else {
@@ -589,84 +589,84 @@ final class NodaTimeSplitter {
         }
 
         // German MM.JJJJ
-        if (preg_match("/^[0-9]{2}\.[0-9]{4}$/", $datum)) { // German Y-m
-            $start = substr($datum, 3, 4);
-            $month = substr($datum, 0, 2);
+        if (\preg_match("/^[0-9]{2}\.[0-9]{4}$/", $datum)) { // German Y-m
+            $start = \substr($datum, 3, 4);
+            $month = \substr($datum, 0, 2);
             return [$start, $start, $month, "00", "+", ""];
         }
-        if (preg_match("/^[0-9]\.[0-9]{4}$/", $datum)) { // German Y-m
-            $start = substr($datum, 2, 4);
-            $month = "0" . substr($datum, 0, 1);
+        if (\preg_match("/^[0-9]\.[0-9]{4}$/", $datum)) { // German Y-m
+            $start = \substr($datum, 2, 4);
+            $month = "0" . \substr($datum, 0, 1);
             return [$start, $start, $month, "00", "+", ""];
         }
-        if (preg_match("/^[0-9]{4}\.[0-9]{2}\.[0-9]{1,2}(\.|)$/", $datum)) { // Hungarian Y-m-d
-            $start = substr($datum, 0, 4);
-            $month = substr($datum, 5, 2);
-            $day = self::pad_to_two(substr($datum, 8, 2));
-            if (intval($month) < 13) return [$start, $start, $month, $day, "+", ""];
+        if (\preg_match("/^[0-9]{4}\.[0-9]{2}\.[0-9]{1,2}(\.|)$/", $datum)) { // Hungarian Y-m-d
+            $start = \substr($datum, 0, 4);
+            $month = \substr($datum, 5, 2);
+            $day = self::pad_to_two(\substr($datum, 8, 2));
+            if (\intval($month) < 13) return [$start, $start, $month, $day, "+", ""];
         }
-        if (preg_match("/^[0-9]{4}\.[0-9]{2}(\.|)$/", $datum)) { // Hungarian Y-m
-            $start = substr($datum, 0, 4);
-            $month = substr($datum, 5, 2);
-            if (intval($month) < 13) return [$start, $start, $month, "00", "+", ""];
+        if (\preg_match("/^[0-9]{4}\.[0-9]{2}(\.|)$/", $datum)) { // Hungarian Y-m
+            $start = \substr($datum, 0, 4);
+            $month = \substr($datum, 5, 2);
+            if (\intval($month) < 13) return [$start, $start, $month, "00", "+", ""];
         }
-        if (preg_match("/^[0-9]{4}\-[0-9]{2}$/", $datum)) { // Time spans: 1945-46
-            $start = substr($datum, 0, 4);
-            $endDigits = substr($datum, 5, 2);
-            if (intval($endDigits) > 12) return [$start, substr($datum, 0, 2) . $endDigits, "00", "00", "+", ""];
+        if (\preg_match("/^[0-9]{4}\-[0-9]{2}$/", $datum)) { // Time spans: 1945-46
+            $start = \substr($datum, 0, 4);
+            $endDigits = \substr($datum, 5, 2);
+            if (\intval($endDigits) > 12) return [$start, \substr($datum, 0, 2) . $endDigits, "00", "00", "+", ""];
         }
 
         // 01.01.1920-31.12.1930
-        if (preg_match("/^01\.01\.[0-9]{4}\-31\.12\.[0-9]{4}$/", $datum)) { // Hungarian Y-m
-            $start = substr($datum, 6, 4);
-            $end = substr($datum, -4);
+        if (\preg_match("/^01\.01\.[0-9]{4}\-31\.12\.[0-9]{4}$/", $datum)) { // Hungarian Y-m
+            $start = \substr($datum, 6, 4);
+            $end = \substr($datum, -4);
             return [$start, $end, "00", "00", "+", ""];
         }
 
         // 303-305 (n. Chr.)
-        if (preg_match("/^[0-9]{3}\-[0-9]{3}$/", $datum)) { // Hungarian Y-m
-            $start = substr($datum, 0, 3);
-            $end = substr($datum, -3);
+        if (\preg_match("/^[0-9]{3}\-[0-9]{3}$/", $datum)) { // Hungarian Y-m
+            $start = \substr($datum, 0, 3);
+            $end = \substr($datum, -3);
             return ["0" . $start, "0" . $end, "00", "00", "+", ""];
         }
 
         // 1720-120
-        if (preg_match("/^[0-9]{4}\-[0-9]{3}$/", $datum)) { // Hungarian Y-m
-            $start = substr($datum, 0, 4);
-            $end = substr($datum, -3);
+        if (\preg_match("/^[0-9]{4}\-[0-9]{3}$/", $datum)) { // Hungarian Y-m
+            $start = \substr($datum, 0, 4);
+            $end = \substr($datum, -3);
             return ["0" . $start, "0" . $end, "00", "00", "+", ""];
         }
 
         // 20-30 (n. Chr.)
-        if (preg_match("/^[0-9]{2}\-[0-9]{2}$/", $datum)) { // 20-40 (n. Chr.)
-            $start = substr($datum, 0, 2);
-            $end = substr($datum, -2);
+        if (\preg_match("/^[0-9]{2}\-[0-9]{2}$/", $datum)) { // 20-40 (n. Chr.)
+            $start = \substr($datum, 0, 2);
+            $end = \substr($datum, -2);
             return ["00" . $start, "00" . $end, "00", "00", "+", ""];
         }
 
         // 1920
-        if (preg_match("/^[0-9]{4}(\.|)$/", $datum)) {
-            $start = substr($datum, 0, 4);
+        if (\preg_match("/^[0-9]{4}(\.|)$/", $datum)) {
+            $start = \substr($datum, 0, 4);
             return [$start, $start, "00", "00", "+", ""];
         }
 
         // 1920
-        if (preg_match("/^[0-9]{3}$/", $datum)) {
-            $start = "0" . substr($datum, 0, 3);
+        if (\preg_match("/^[0-9]{3}$/", $datum)) {
+            $start = "0" . \substr($datum, 0, 3);
             return [$start, $start, "00", "00", "+", ""];
         }
 
-        if (preg_match("/^[0-9]{2}$/", $datum)) {
-            $start = "00" . substr($datum, 0, 2);
+        if (\preg_match("/^[0-9]{2}$/", $datum)) {
+            $start = "00" . \substr($datum, 0, 2);
             return [$start, $start, "00", "00", "+", ""];
         }
 
         // Special case for SMB: YYYY, MM. DD and YYYY, MM.
 
-        if (preg_match("/^[0-9]{4}\,\ [0-9]{2}\.(|\ [0-9]{2})$/", $datum)) {
-            $start = substr($datum, 0, 4);
-            $month = substr($datum, 6, 2);
-            $day = self::pad_to_two(substr($datum, 10, 2));
+        if (\preg_match("/^[0-9]{4}\,\ [0-9]{2}\.(|\ [0-9]{2})$/", $datum)) {
+            $start = \substr($datum, 0, 4);
+            $month = \substr($datum, 6, 2);
+            $day = self::pad_to_two(\substr($datum, 10, 2));
             return [$start, $start, $month, $day, "+", ""];
         }
 
@@ -685,146 +685,146 @@ final class NodaTimeSplitter {
 
         $datum = self::clean_input($datum);
 
-        if (preg_match("/^[0-9]{4}\.[0-9]{2}\.[0-9]{2}(\.|)\-$/", $datum)) { // Hungarian Y-m
-            $start = substr($datum, 0, 4);
-            $month = substr($datum, 5, 2);
-            $day = substr($datum, 8, 2);
+        if (\preg_match("/^[0-9]{4}\.[0-9]{2}\.[0-9]{2}(\.|)\-$/", $datum)) { // Hungarian Y-m
+            $start = \substr($datum, 0, 4);
+            $month = \substr($datum, 5, 2);
+            $day = \substr($datum, 8, 2);
             return [$start, "?", $month, $day, "+", ""];
         }
-        if (preg_match("/^[0-9]{4}\.[0-9]{2}(\.|)\-$/", $datum)) { // Hungarian Y-m
-            $start = substr($datum, 0, 4);
-            $month = substr($datum, 5, 2);
+        if (\preg_match("/^[0-9]{4}\.[0-9]{2}(\.|)\-$/", $datum)) { // Hungarian Y-m
+            $start = \substr($datum, 0, 4);
+            $month = \substr($datum, 5, 2);
             return [$start, "?", $month, "00", "+", ""];
         }
-        if (preg_match("/^[0-9]{4}\-$/", $datum)) { // Hungarian Y-
-            $start = substr($datum, 0, 4);
+        if (\preg_match("/^[0-9]{4}\-$/", $datum)) { // Hungarian Y-
+            $start = \substr($datum, 0, 4);
             return [$start, "?", "00", "00", "+", ""];
         }
 
-        if (preg_match("/^\-[0-9]{4}\.[0-9]{2}\.[0-9]{2}$/", $datum)) { // Hungarian Y-m
-            $start = substr($datum, 1, 4);
-            $month = substr($datum, 6, 2);
-            $day = substr($datum, 9, 2);
+        if (\preg_match("/^\-[0-9]{4}\.[0-9]{2}\.[0-9]{2}$/", $datum)) { // Hungarian Y-m
+            $start = \substr($datum, 1, 4);
+            $month = \substr($datum, 6, 2);
+            $day = \substr($datum, 9, 2);
             return ["?", $start, $month, $day, "+", ""];
         }
-        if (preg_match("/^\-[0-9]{4}\.[0-9]{2}$/", $datum)) { // Hungarian Y-m
-            $start = substr($datum, 1, 4);
-            $month = substr($datum, 6, 2);
+        if (\preg_match("/^\-[0-9]{4}\.[0-9]{2}$/", $datum)) { // Hungarian Y-m
+            $start = \substr($datum, 1, 4);
+            $month = \substr($datum, 6, 2);
             return ["?", $start, $month, "00", "+", ""];
         }
-        if (preg_match("/^\-[0-9]{4}$/", $datum)) { // Hungarian -Y
-            $start = substr($datum, 1, 4);
+        if (\preg_match("/^\-[0-9]{4}$/", $datum)) { // Hungarian -Y
+            $start = \substr($datum, 1, 4);
             return ["?", $start, "00", "00", "+", ""];
         }
 
-        if (preg_match("/^(Nach|nach)\ /", $datum)) {
-            if (($spacePos = strpos($datum, " ")) === false) {
+        if (\preg_match("/^(Nach|nach)\ /", $datum)) {
+            if (($spacePos = \strpos($datum, " ")) === false) {
                 return [];
             }
-            if ($output = self::attempt_splitting(substr($datum, $spacePos))) {
+            if ($output = self::attempt_splitting(\substr($datum, $spacePos))) {
 
                 // Handle cases like "Nach 60er Jahre" with divergent start and end year
-                if ($output[1] !== $output[0] and intval($output[1]) > intval($output[0])) {
+                if ($output[1] !== $output[0] and \intval($output[1]) > \intval($output[0])) {
                     $output[0] = $output[1];
                 }
 
                 $output[1] = "?";
-                if (empty(trim($output[2], "0 .,"))) $output[0] = strval((intval($output[0]) + 1));
+                if (empty(trim($output[2], "0 .,"))) $output[0] = \strval((\intval($output[0]) + 1));
                 $output[5] = "Nach";
                 return $output;
             }
         }
 
-        if (preg_match("/\ (\(nach|nach)$/", $datum)) {
-            if (($spacePos = strpos($datum, " ")) === false) {
+        if (\preg_match("/\ (\(nach|nach)$/", $datum)) {
+            if (($spacePos = \strpos($datum, " ")) === false) {
                 return [];
             }
-            if ($output = self::attempt_splitting(substr($datum, 0, $spacePos))) {
+            if ($output = self::attempt_splitting(\substr($datum, 0, $spacePos))) {
 
                 // Handle cases like "Nach 60er Jahre" with divergent start and end year
-                if ($output[1] !== $output[0] and intval($output[1]) > intval($output[0])) {
+                if ($output[1] !== $output[0] and \intval($output[1]) > \intval($output[0])) {
                     $output[0] = $output[1];
                 }
 
                 $output[1] = "?";
-                if (empty(trim($output[2], "0 .,"))) $output[0] = strval((intval($output[0]) + 1));
+                if (empty(trim($output[2], "0 .,"))) $output[0] = \strval((\intval($output[0]) + 1));
                 $output[5] = "Nach";
                 return $output;
             }
         }
 
-        if (preg_match("/^(Vor|vor)\ /", $datum)) {
-            if (($spacePos = strpos($datum, " ")) === false) {
+        if (\preg_match("/^(Vor|vor)\ /", $datum)) {
+            if (($spacePos = \strpos($datum, " ")) === false) {
                 return [];
             }
-            if ($output = self::attempt_splitting(substr($datum, $spacePos))) {
+            if ($output = self::attempt_splitting(\substr($datum, $spacePos))) {
 
                 $output[0] = "?";
-                if (empty(trim($output[2], "0 .,"))) $output[1] = strval((intval($output[1]) - 1));
+                if (empty(trim($output[2], "0 .,"))) $output[1] = \strval((\intval($output[1]) - 1));
                 $output[5] = "Vor";
                 return $output;
             }
         }
 
-        if (preg_match("/\ (\(vor|\(Vor|vor)$/", $datum)) {
-            if (($spacePos = strpos($datum, " ")) === false) {
+        if (\preg_match("/\ (\(vor|\(Vor|vor)$/", $datum)) {
+            if (($spacePos = \strpos($datum, " ")) === false) {
                 return [];
             }
-            if ($output = self::attempt_splitting(substr($datum, 0, $spacePos))) {
+            if ($output = self::attempt_splitting(\substr($datum, 0, $spacePos))) {
 
                 $output[0] = "?";
-                if (empty(trim($output[2], "0 .,"))) $output[1] = strval((intval($output[1]) - 1));
+                if (empty(trim($output[2], "0 .,"))) $output[1] = \strval((\intval($output[1]) - 1));
                 $output[5] = "Vor";
                 return $output;
             }
         }
 
-        if (preg_match("/^(Ab|Seit|seit)\ /", $datum)) {
-            if (($spacePos = strpos($datum, " ")) === false) {
+        if (\preg_match("/^(Ab|Seit|seit)\ /", $datum)) {
+            if (($spacePos = \strpos($datum, " ")) === false) {
                 return [];
             }
-            if ($output = self::attempt_splitting(substr($datum, $spacePos))) {
+            if ($output = self::attempt_splitting(\substr($datum, $spacePos))) {
                 $output[1] = "?";
                 return $output;
             }
         }
 
         // Endings beginning with a space
-        if (preg_match("/(\-től)$/", $datum)) {
+        if (\preg_match("/(\-től)$/", $datum)) {
             if (($spacePos = strrpos($datum, "-")) === false) {
                 return [];
             }
-            if ($output = self::attempt_splitting(substr($datum, 0, $spacePos))) {
+            if ($output = self::attempt_splitting(\substr($datum, 0, $spacePos))) {
                 $output[1] = "?";
                 return $output;
             }
         }
 
-        if (preg_match("/^(Bis|bis)\ /", $datum)) {
-            if (($spacePos = strpos($datum, " ")) === false) {
+        if (\preg_match("/^(Bis|bis)\ /", $datum)) {
+            if (($spacePos = \strpos($datum, " ")) === false) {
                 return [];
             }
-            if ($output = self::attempt_splitting(substr($datum, $spacePos))) {
+            if ($output = self::attempt_splitting(\substr($datum, $spacePos))) {
                 $output[0] = "?";
                 return $output;
             }
         }
 
         // Endings beginning with a space
-        if (preg_match("/ (\(bis)$/", $datum)) {
+        if (\preg_match("/ (\(bis)$/", $datum)) {
             if (($spacePos = strrpos($datum, " ")) === false) {
                 return [];
             }
-            if ($output = self::attempt_splitting(substr($datum, 0, $spacePos))) {
+            if ($output = self::attempt_splitting(\substr($datum, 0, $spacePos))) {
                 $output[0] = "?";
                 return $output;
             }
         }
-        if (preg_match("/\-ig$/", $datum)) {
+        if (\preg_match("/\-ig$/", $datum)) {
             if (($spacePos = strrpos($datum, "-")) === false) {
                 return [];
             }
-            if ($output = self::attempt_splitting(substr($datum, 0, $spacePos))) {
+            if ($output = self::attempt_splitting(\substr($datum, 0, $spacePos))) {
                 $output[0] = "?";
                 return $output;
             }
@@ -844,8 +844,8 @@ final class NodaTimeSplitter {
      */
     public static function negotiate_century_span_bce_ce(string $start, string $end):array {
 
-        $start = intval($start);
-        $end = intval($end);
+        $start = \intval($start);
+        $end = \intval($end);
 
         if ($start < $end) {
             return [(string)($start - 1) . "01", $end . "00", "00", "00", "+", ""];
@@ -868,44 +868,44 @@ final class NodaTimeSplitter {
         $bcBceIndicator = '+';
 
         // 17. Jahrhundert
-        if (preg_match("/^[0-9][0-9]\.\ (Jh\.|Jahrhundert|sz|század)$/", $datum)) {
-            if ($centuryNo = intval(substr($datum, 0, 2))) {
+        if (\preg_match("/^[0-9][0-9]\.\ (Jh\.|Jahrhundert|sz|század)$/", $datum)) {
+            if ($centuryNo = \intval(\substr($datum, 0, 2))) {
                 $centuryNo--;
-                return [(string)$centuryNo . "01", strval($centuryNo + 1) . "00", "00", "00", $bcBceIndicator, ""];
+                return [(string)$centuryNo . "01", \strval($centuryNo + 1) . "00", "00", "00", $bcBceIndicator, ""];
             }
         }
 
         // 1. Jahrhundert
-        if (preg_match("/^[0-9]\.\ (Jh\.|Jahrhundert|sz|század)$/", $datum)) {
-            if ($centuryNo = intval(substr($datum, 0, 1))) {
+        if (\preg_match("/^[0-9]\.\ (Jh\.|Jahrhundert|sz|század)$/", $datum)) {
+            if ($centuryNo = \intval(\substr($datum, 0, 1))) {
                 $centuryNo--;
-                return [(string)$centuryNo . "01", strval($centuryNo + 1) . "00", "00", "00", $bcBceIndicator, ""];
+                return [(string)$centuryNo . "01", \strval($centuryNo + 1) . "00", "00", "00", $bcBceIndicator, ""];
             }
         }
 
         // 17.-18. Jahrhundert
-        if (preg_match("/^[0-9]{2}(\.|)(|\ Jh\.||\ Jahrhundert||\ sz||\ század)\-[0-9]{2}\.\ (Jh\.|Jahrhundert|sz|század)$/", $datum)) {
-            if (($dashPos = strpos($datum, "-")) !== false) {
-                return self::negotiate_century_span_bce_ce(substr($datum, 0, 2), substr($datum, $dashPos + 1, 2));
+        if (\preg_match("/^[0-9]{2}(\.|)(|\ Jh\.||\ Jahrhundert||\ sz||\ század)\-[0-9]{2}\.\ (Jh\.|Jahrhundert|sz|század)$/", $datum)) {
+            if (($dashPos = \strpos($datum, "-")) !== false) {
+                return self::negotiate_century_span_bce_ce(\substr($datum, 0, 2), \substr($datum, $dashPos + 1, 2));
             }
         }
 
         // 1.-12. Jahrhundert
-        if (preg_match("/^[0-9](\.|)(|\ Jh\.||\ Jahrhundert||\ sz||\ század)\-[0-9]{2}\.\ (Jh\.|Jahrhundert|sz|század)$/", $datum)) {
-            if (($dashPos = strpos($datum, "-")) !== false) {
-                return self::negotiate_century_span_bce_ce(substr($datum, 0, 1), substr($datum, $dashPos + 1, 2));
+        if (\preg_match("/^[0-9](\.|)(|\ Jh\.||\ Jahrhundert||\ sz||\ század)\-[0-9]{2}\.\ (Jh\.|Jahrhundert|sz|század)$/", $datum)) {
+            if (($dashPos = \strpos($datum, "-")) !== false) {
+                return self::negotiate_century_span_bce_ce(\substr($datum, 0, 1), \substr($datum, $dashPos + 1, 2));
             }
         }
         // 1.-2. Jahrhundert
-        if (preg_match("/^[0-9](\.|)(|\ Jh\.||\ Jahrhundert||\ sz||\ század)\-[0-9]\.\ (Jh\.|Jahrhundert|sz|század)$/", $datum)) {
-            if (($dashPos = strpos($datum, "-")) !== false) {
-                return self::negotiate_century_span_bce_ce(substr($datum, 0, 1), substr($datum, $dashPos + 1, 1));
+        if (\preg_match("/^[0-9](\.|)(|\ Jh\.||\ Jahrhundert||\ sz||\ század)\-[0-9]\.\ (Jh\.|Jahrhundert|sz|század)$/", $datum)) {
+            if (($dashPos = \strpos($datum, "-")) !== false) {
+                return self::negotiate_century_span_bce_ce(\substr($datum, 0, 1), \substr($datum, $dashPos + 1, 1));
             }
         }
         // 1-2. Jahrhundert
-        if (preg_match("/^[0-9](\.|)(|\ Jh\.||\ Jahrhundert||\ sz||\ század)\-[0-9]\.\ (Jh\.|Jahrhundert|sz|század)$/", $datum)) {
-            if (($dashPos = strpos($datum, "-")) !== false) {
-                return self::negotiate_century_span_bce_ce(substr($datum, 0, 1), substr($datum, $dashPos + 1, 1));
+        if (\preg_match("/^[0-9](\.|)(|\ Jh\.||\ Jahrhundert||\ sz||\ század)\-[0-9]\.\ (Jh\.|Jahrhundert|sz|század)$/", $datum)) {
+            if (($dashPos = \strpos($datum, "-")) !== false) {
+                return self::negotiate_century_span_bce_ce(\substr($datum, 0, 1), \substr($datum, $dashPos + 1, 1));
             }
         }
 
@@ -925,15 +925,15 @@ final class NodaTimeSplitter {
         $datum = self::clean_input($datum);
         $bcBceIndicator = '+';
 
-        if (preg_match("/^[0-9]0(er|er\ Jahre|\-es\ évek|\-as\ \évek)$/", $datum)) {
-            $start = "19" . substr($datum, 0, 2);
-            $ende = (string)(intval($start) + 9);
+        if (\preg_match("/^[0-9]0(er|er\ Jahre|\-es\ évek|\-as\ \évek)$/", $datum)) {
+            $start = "19" . \substr($datum, 0, 2);
+            $ende = (string)(\intval($start) + 9);
             return [$start, $ende, "00", "00", $bcBceIndicator, ""];
         }
 
-        if (preg_match("/^[0-9]{3}0(er|er\ Jahre|\-es\ évek|\-as\ \évek)$/", $datum)) {
-            $start = substr($datum, 0, 4);
-            $ende = (string)(intval($start) + 9);
+        if (\preg_match("/^[0-9]{3}0(er|er\ Jahre|\-es\ évek|\-as\ \évek)$/", $datum)) {
+            $start = \substr($datum, 0, 4);
+            $ende = (string)(\intval($start) + 9);
             return [$start, $ende, "00", "00", $bcBceIndicator, ""];
         }