diff --git a/csv_check.php b/csv_check.php
index 3bf6117..4be0060 100644
--- a/csv_check.php
+++ b/csv_check.php
@@ -64,7 +64,8 @@ $fp = fopen ( $csv_datei, 'r' );
 $y = 1;
 $error = 0;
 $zeile = fgetcsv( $fp, 100000, ';' );
-for ($x = 0; $x < count($zeile); $x++) {
+$maxLoopLen = count($zeile);
+for ($x = 0; $x < $maxLoopLen; $x++) {
 
     $zeile[$x] = str_replace("\xEF\xBB\xBF", "", $zeile[$x]);
     $inhalt[$y][$x] = $zeile[$x];
@@ -98,7 +99,8 @@ $y = 0;
 while ($zeile = fgetcsv($fp, 100000, ';')) {
 
     $y++;
-    for ($x = 0; $x < count ( $zeile ); $x++) {
+    $maxLoopLen = count($zeile);
+    for ($x = 0; $x < $maxLoopLen; $x++) {
         $inhalt[$y][$x] = str_replace("'", "\'", $zeile[$x]);
     }
 }
@@ -109,27 +111,34 @@ echo '<br><br>3: Mandatory tags available and always filled in?';
 unset($inv_array);
 $inv_error = 0;
 
-function get_duplicates($array) {
-    return array_unique( array_diff_assoc( $array, array_unique( $array ) ) );
+/**
+ * Function for finding duplicates?.
+ *
+ * @param array $array Input array.
+ *
+ * @return array
+ */
+function get_duplicates(array $array):array {
+    return array_unique(array_diff_assoc($array, array_unique($array)));
 
 }
 
 $mandatory = ['inventory_number','object_type','object_title','object_description'];
-for ($i = 0; $i < count($mandatory); $i++) {
-    if (!in_array($mandatory[$i], $erstezeile)) {
-        echo '<br><i style="font-style:normal;color:#990000;">Mandatory: Column <b>' . $mandatory[$i] . '</b> missing</i>';
+foreach ($mandatory as $tMandatoryField) {
+    if (!in_array($tMandatoryField, $erstezeile)) {
+        echo '<br><i style="font-style:normal;color:#990000;">Mandatory: Column <b>' . $tMandatoryField . '</b> missing</i>';
         $error = $error + 1;
         $inv_error = $inv_error + 1;
     }
     else {
-        $spaltenr = array_search($mandatory[$i], $erstezeile);
+        $spaltenr = array_search($tMandatoryField, $erstezeile);
         for ($j = 0; $j < $y; $j++) {
             if ($inhalt[$j + 1][$spaltenr] == '') {
-                echo '<br><i style="font-style:normal;color:#990000;">Missing value for <b>' . $mandatory[$i] . '</b> in row ' . ($j + 1) . '</i>';
+                echo '<br><i style="font-style:normal;color:#990000;">Missing value for <b>' . $tMandatoryField . '</b> in row ' . ($j + 1) . '</i>';
                 $error = $error + 1;
                 $inv_error = $inv_error + 1;
             }
-            if ($mandatory[$i] == 'inventory_number') {
+            if ($tMandatoryField == 'inventory_number') {
                 $inv_array[] = $inhalt[$j + 1][$spaltenr];
             }
         }
@@ -143,17 +152,15 @@ echo '<br><br>4: Inventory_number unique ?';
 if (in_array('inventory_number', $erstezeile)) {
     $doppelte_inv = get_duplicates($inv_array);
     $doppelte_inv = array_values($doppelte_inv);
-    if (count($doppelte_inv) > 0) {
-        for ($i = 0; $i < count($doppelte_inv); $i++)
-        {
-            echo '<br><i style="font-style:normal;color:#990000;">Multiple use of inventory_number <b>' . $doppelte_inv[$i] . '</b></i>';
+    if (!empty($doppelte_inv)) {
+        foreach ($doppelte_inv as $tDublicateInvNo) {
+            echo '<br><i style="font-style:normal;color:#990000;">Multiple use of inventory_number <b>' . $tDublicateInvNo . '</b></i>';
             $error = $error + 1;
         }
     }
     else echo '<br><i style="font-style:normal;color:#009900;">All inventory_numbers are unique !</i>';
 }
-else
-{
+else {
     echo '<br><b style="font-style:normal;color:#990000;">Aborted, column inventory_number is missing</b>';
     $error = $error + 1;
 }
@@ -175,11 +182,10 @@ foreach ($fieldsWithDependency as $tField => $tDependentFields) {
 
 }
 
-if (isset($depencymessage) and $depencymessage != '') {
+if (!empty($depencymessage)) {
     echo '<b style="color:#990000;">Dependent columns were not observed !</b>';
-    for ($i = 0; $i < count ($depencymessage); $i++)
-    {
-        echo '<br>' . $depencymessage[$i];
+    foreach ($depencymessage as $tDepMsg) {
+        echo '<br>' . $tDepMsg;
         $error = $error + 1;
     }
 }
@@ -194,14 +200,14 @@ $crosscheck1 = ['object_other_title','detailed_description','detailed_descriptio
 $crosscheck2 = ['object_other_title_kind_of','detailed_description_md','detailed_description_extern','inscription_md','inscription_extern','dimensions_separate_length_unit', 'dimensions_separate_width_unit', 'dimensions_separate_height_unit', 'dimensions_separate_diameter_unit', 'dimensions_separate_wall_thickness_unit', 'dimensions_separate_weight_unit','closer_location_as','bought_for_currency','worth_unit','worth_insurance_unit'];
 
 $depcon_error = 0;
-for ($l = 0; $l < count($crosscheck1); $l++) {
+foreach ($crosscheck1 as $tCrossCheck) {
 
-    if (in_array($crosscheck1[$l], $erstezeile)) {
+    if (in_array($tCrossCheck, $erstezeile)) {
 
         for ($j = 1; $j < ($y + 1); $j++) {
-            if ($inhalt[$j][array_search($crosscheck2[$l], $erstezeile)] !== '' and $inhalt[$j][array_search($crosscheck1[$l], $erstezeile)] == '') {
-                echo '<br>Tag <b>' . $crosscheck2[$l] . '</b> given but no entry for <b>' . $crosscheck1[$l] . '</b> (row ' . $j . ')';
-                $depcon_error = $depcon_error + 1;
+            if ($inhalt[$j][array_search($crosscheck2[$l], $erstezeile)] !== '' and $inhalt[$j][array_search($tCrossCheck, $erstezeile)] == '') {
+                echo '<br>Tag <b>' . $crosscheck2[$l] . '</b> given but no entry for <b>' . $tCrossCheck . '</b> (row ' . $j . ')';
+                $depcon_error++;
             }
         }
 
@@ -214,7 +220,7 @@ for ($l = 0; $l < count($eventpart); $l++) {
         for ($j = 1; $j < ($y + 1); $j++) {
             if ($inhalt[$j][array_search($eventpartsure[$l], $erstezeile)] !== '' and $inhalt[$j][array_search($eventpart[$l], $erstezeile)] == '') {
                 echo '<br>Tag <b>' . $eventpartsure[$l] . '</b> given but no entry for <b>' . $eventpart[$l] . '</b> (row ' . $j . ')';
-                $depcon_error = $depcon_error + 1;
+                $depcon_error++;
             }
         }
     }