551                     $haystack = self::mb_substr($haystack, 0, $offset, $encoding);
555                 $haystack = self::mb_substr($haystack, $offset, 2147483647, $encoding);
603             $result[] = mb_substr($string, $i, $split_length, $encoding);
637     public static function mb_substr($s, $start, $length = null, $encoding = null)  function in Symfony\\Polyfill\\Mbstring\\Mbstring
686             $needle = self::mb_substr($needle, 0, 1, $encoding);
695         $needle = self::mb_substr($needle, 0, 1, $encoding);
863 …return self::mb_substr(str_repeat($pad_string, $paddingRequired), 0, $paddingRequired, $encoding).…
865 …return $string.self::mb_substr(str_repeat($pad_string, $paddingRequired), 0, $paddingRequired, $en…
870 …return self::mb_substr(str_repeat($pad_string, $leftPaddingLength), 0, $leftPaddingLength, $encodi…
880             return self::mb_substr($haystack, 0, $pos, $encoding);
883         return self::mb_substr($haystack, $pos, null, $encoding);