494     public static function mb_strpos($haystack, $needle, $offset = 0, $encoding = null)  argument
498             return strpos($haystack, $needle, $offset);
501         $needle = (string) $needle;
502         if ('' === $needle) {
512         return \iconv_strpos($haystack, $needle, $offset, $encoding);
515     public static function mb_strrpos($haystack, $needle, $offset = 0, $encoding = null)  argument
519             return strrpos($haystack, $needle, $offset);
526                 if (0 > $offset += self::mb_strlen($needle)) {
535         $pos = '' !== $needle || 80000 > \PHP_VERSION_ID
536             ? \iconv_strrpos($haystack, $needle, $encoding)
638     public static function mb_stripos($haystack, $needle, $offset = 0, $encoding = null)  argument
641         $needle = self::mb_convert_case($needle, 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, $encoding);
653     public static function mb_strrchr($haystack, $needle, $part = false, $encoding = null)  argument
657             $pos = strrpos($haystack, $needle);
659             $needle = self::mb_substr($needle, 0, 1, $encoding);
660             $pos = \iconv_strrpos($haystack, $needle, $encoding);
666     public static function mb_strrichr($haystack, $needle, $part = false, $encoding = null)  argument
668         $needle = self::mb_substr($needle, 0, 1, $encoding);
669         $pos = self::mb_strripos($haystack, $needle, $encoding);
674     public static function mb_strripos($haystack, $needle, $offset = 0, $encoding = null)  argument
677         $needle = self::mb_convert_case($needle, 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, $needle);
747     public static function mb_substr_count($haystack, $needle, $encoding = null)  argument
749         return substr_count($haystack, $needle);