(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 >= 4.0.6, PHP 5, PHP 7) Return width of string int mb_strwidth ( string $str [, string $encoding = mb_internal_encoding() ] ) Returns the width of string str. Multi-byte characters are usually twice the width of single byte characters. Characters width Chars Width U+0000 - U+0019 0 U+0020 - U+1FFF 1 U+2000 - U+FF60 2 U+FF61 - U+FF9F 1 U+FFA0 - 2 Parameters: str The string

(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 4 >= 4.0.6, PHP 5, PHP 7) Set/Get substitution character mixed mb_substitute_character ([ mixed $substrchar = mb_substitute_character() ] ) Specifies a substitution character when input character encoding is invalid or character code does not exist in output character encoding. Invalid characters may be substituted NULL (no output), string or integer value (Unicode character code value). This setting affects mb_co

(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 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 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 position of first occurrence of a string within another, case insensitive int mb_stripos ( string $haystack, string $needle [, int $offset = 0 [, string $encoding = mb_internal_encoding() ]] ) mb_stripos() returns the numeric position of the first occurrence of needle in the haystack string. Unlike mb_strpos(), mb_stripos() is case-insensitive. If needle is not found, it returns FALSE.