diff --git a/MD_STD.php b/MD_STD.php
index f49055c..5335ec9 100644
--- a/MD_STD.php
+++ b/MD_STD.php
@@ -91,7 +91,7 @@ class MD_STD {
      */
     public static function startsWith(string $haystack, string $needle):bool {
 
-        if (substr($haystack, 0, strlen($needle)) == $needle) return true;
+        if (substr($haystack, 0, \strlen($needle)) == $needle) return true;
         else return false;
 
     }
@@ -179,19 +179,19 @@ class MD_STD {
      */
     public static function runCurl(string $url, int $timeout = 1200):string {
 
-        $curl = curl_init();
+        $curl = \curl_init();
 
-        curl_setopt($curl, CURLOPT_URL, $url);
-        curl_setopt($curl, CURLOPT_HEADER, false);
-        curl_setopt($curl, CURLOPT_CONNECTTIMEOUT_MS, $timeout); //timeout in seconds
-        curl_setopt($curl, CURLOPT_TIMEOUT_MS, $timeout);        //timeout in seconds
-        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
-        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
-        curl_setopt($curl, CURLOPT_USERAGENT, 'md-bot/1.0');
-        $result = curl_exec($curl);
+        \curl_setopt($curl, CURLOPT_URL, $url);
+        \curl_setopt($curl, CURLOPT_HEADER, false);
+        \curl_setopt($curl, CURLOPT_CONNECTTIMEOUT_MS, $timeout); //timeout in seconds
+        \curl_setopt($curl, CURLOPT_TIMEOUT_MS, $timeout);        //timeout in seconds
+        \curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
+        \curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
+        \curl_setopt($curl, CURLOPT_USERAGENT, 'md-bot/1.0');
+        $result = \curl_exec($curl);
 
-        curl_close($curl);
-        if (is_bool($result)) return "";
+        \curl_close($curl);
+        if (\is_bool($result)) return "";
         return $result;
 
     }
@@ -293,7 +293,7 @@ class MD_STD {
      */
     public static function filesize(string $filename):int {
 
-        $output = filesize($filename);
+        $output = \filesize($filename);
 
         if ($output === false) {
             throw new Exception("Cannot get filesize of file {$filename}");