Merge branch 'hotfix/3324'

Close zendframework/zendframework#3324

src/Converter/Converter.php

@@ -38,7 +38,7 @@ class Converter
      */
     public static function ascToHex32($string)
     {
-        for ($i = 0; $i < strlen($string); $i++) {
+        for ($i = 0, $len = strlen($string); $i < $len; $i++) {
             $char = substr($string, $i, 1);
             if (ord($char) < 32) {
                 $hex = dechex(ord($char));

src/Dn.php

@@ -484,10 +484,10 @@ public static function escapeValue($values = array())
             // Convert all leading and trailing spaces to sequences of \20.
             if (preg_match('/^(\s*)(.+?)(\s*)$/', $val, $matches)) {
                 $val = $matches[2];
-                for ($i = 0; $i < strlen($matches[1]); $i++) {
+                for ($i = 0, $len = strlen($matches[1]); $i < $len; $i++) {
                     $val = '\20' . $val;
                 }
-                for ($i = 0; $i < strlen($matches[3]); $i++) {
+                for ($i = 0, $len = strlen($matches[3]); $i < $len; $i++) {
                     $val = $val . '\20';
                 }
             }

src/Ldif/Encoder.php

@@ -194,7 +194,7 @@ protected function encodeString($string, &$base64 = null)
         $unsafe_char = array(0, 10, 13);
 
         $base64 = false;
-        for ($i = 0; $i < strlen($string); $i++) {
+        for ($i = 0, $len = strlen($string); $i < $len; $i++) {
             $char = ord(substr($string, $i, 1));
             if ($char >= 127) {
                 $base64 = true;