(PHP 4 >= 4.3.0, PHP 5, PHP 7) Make a string uppercase string mb_strtoupper ( string $str [, string $encoding = mb_internal_encoding() ] ) Returns str with all alphabetic characters converted to uppercase. Parameters: str The string being uppercased. encoding The encoding parameter is the character encoding. If it is omitted, the int

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Make a string lowercase string mb_strtolower ( string $str [, string $encoding = mb_internal_encoding() ] ) Returns str with all alphabetic characters converted to lowercase. Parameters: str The string being lowercased. encoding The encoding parameter is the character encoding. If it is omitted, the int

(PHP 5 >= 5.2.0, PHP 7) Finds first occurrence of a string within another string mb_strstr ( string $haystack, string $needle [, bool $before_needle = false [, string $encoding = mb_internal_encoding() ]] ) mb_strstr() finds the first occurrence of needle in haystack and returns the portion of haystack. If needle is not found, it returns FALSE. Parameters: haystack T

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Find position of last occurrence of a string in a string int mb_strrpos ( string $haystack, string $needle [, int $offset = 0 [, string $encoding = mb_internal_encoding() ]] ) Performs a multibyte safe strrpos() operation based on the number of characters. needle position is counted from the beginning of haystack. First character's position is 0. Second character position is 1.

(PHP 5 >= 5.2.0, PHP 7) Finds position of last occurrence of a string within another, case insensitive int mb_strripos ( string $haystack, string $needle [, int $offset = 0 [, string $encoding = mb_internal_encoding() ]] ) mb_strripos() performs multi-byte safe strripos() operation based on number of characters. needle position is counted from the beginning of haystack. First character's position is 0. Second character

(PHP 5 >= 5.2.0, PHP 7) Finds the last occurrence of a character in a string within another, case insensitive string mb_strrichr ( string $haystack, string $needle [, bool $part = false [, string $encoding = mb_internal_encoding() ]] ) mb_strrichr() finds the last occurrence of needle in haystack and returns the portion of haystack. Unlike mb_strrchr(), mb_strrichr() is case-insensitive. If needle is not found, it retur

(PHP 5 >= 5.2.0, PHP 7) Finds the last occurrence of a character in a string within another string mb_strrchr ( string $haystack, string $needle [, bool $part = false [, string $encoding = mb_internal_encoding() ]] ) mb_strrchr() finds the last occurrence of needle in haystack and returns the portion of haystack. If needle is not found, it returns FALSE. Parameters: haystack

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Find position of first occurrence of string in a string int mb_strpos ( string $haystack, string $needle [, int $offset = 0 [, string $encoding = mb_internal_encoding() ]] ) Finds position of the first occurrence of a string in a string. Performs a multi-byte safe strpos() operation based on number of characters. The first character's position is 0, the second character position is 1, an

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Get string length mixed mb_strlen ( string $str [, string $encoding = mb_internal_encoding() ] ) Gets the length of a string. Parameters: str The string being checked for length. encoding The encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be us

(PHP 5 >= 5.2.0, PHP 7) Finds first occurrence of a string within another, case insensitive string mb_stristr ( string $haystack, string $needle [, bool $before_needle = false [, string $encoding = mb_internal_encoding() ]] ) mb_stristr() finds the first occurrence of needle in haystack and returns the portion of haystack. Unlike mb_strstr(), mb_stristr() is case-insensitive. If needle is not found, it returns FALSE.