494     public static function mb_strpos($haystack, $needle, $offset = 0, $encoding = null)  argument
498             return strpos($haystack, $needle, $offset);
512         return \iconv_strpos($haystack, $needle, $offset, $encoding);
515     public static function mb_strrpos($haystack, $needle, $offset = 0, $encoding = null)  argument
519             return strrpos($haystack, $needle, $offset);
527                     $haystack = self::mb_substr($haystack, 0, $offset, $encoding);
531                 $haystack = self::mb_substr($haystack, $offset, 2147483647, $encoding);
536             ? \iconv_strrpos($haystack, $needle, $encoding)
537             : self::mb_strlen($haystack, $encoding);
638     public static function mb_stripos($haystack, $needle, $offset = 0, $encoding = null)  argument
640         $haystack = self::mb_convert_case($haystack, self::MB_CASE_FOLD, $encoding);
643         return self::mb_strpos($haystack, $needle, $offset, $encoding);
646     public static function mb_stristr($haystack, $needle, $part = false, $encoding = null)  argument
648         $pos = self::mb_stripos($haystack, $needle, 0, $encoding);
650         return self::getSubpart($pos, $part, $haystack, $encoding);
653     public static function mb_strrchr($haystack, $needle, $part = false, $encoding = null)  argument
657             $pos = strrpos($haystack, $needle);
660             $pos = \iconv_strrpos($haystack, $needle, $encoding);
663         return self::getSubpart($pos, $part, $haystack, $encoding);
666     public static function mb_strrichr($haystack, $needle, $part = false, $encoding = null)  argument
669         $pos = self::mb_strripos($haystack, $needle, $encoding);
671         return self::getSubpart($pos, $part, $haystack, $encoding);
674     public static function mb_strripos($haystack, $needle, $offset = 0, $encoding = null)  argument
676         $haystack = self::mb_convert_case($haystack, self::MB_CASE_FOLD, $encoding);
679         return self::mb_strrpos($haystack, $needle, $offset, $encoding);
682     public static function mb_strstr($haystack, $needle, $part = false, $encoding = null)  argument
684         $pos = strpos($haystack, $needle);
689             return substr($haystack, 0, $pos);
692         return substr($haystack, $pos);
747     public static function mb_substr_count($haystack, $needle, $encoding = null)  argument
749         return substr_count($haystack, $needle);
800     private static function getSubpart($pos, $part, $haystack, $encoding)  argument
806             return self::mb_substr($haystack, 0, $pos, $encoding);
809         return self::mb_substr($haystack, $pos, null, $encoding);