reverted saving to php://temp

Author: adityapatadia

lib/ImageResize.php

@@ -213,12 +213,14 @@ public function save($filename, $image_type = null, $quality = null, $permission
      */
     public function getImageAsString($image_type = null, $quality = null)
     {
-        $string_temp = "php://temp";
+        $string_temp = tempnam(sys_get_temp_dir(), '');
 
         $this->save($string_temp , $image_type, $quality);
 
         $string = file_get_contents($string_temp);
 
+        unlink($string_temp);
+
         return $string;
     }