(PHP 4 >= 4.0.6, PHP 5, PHP 7) Set/Get substitution character

(PHP 5 >= 5.2.0, PHP 7) Finds position of last occurrence of a string within another, case insensitive

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Returns start point for next regular expression match

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Decode HTML numeric string reference to character

(PHP 5 >= 5.2.0, PHP 7) Finds first occurrence of a string within another, case insensitive

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Convert character encoding

(PHP 5 >= 5.2.0, PHP 7) Finds the last occurrence of a character in a string within another, case insensitive

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Get internal settings of mbstring

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Decode string in MIME header field

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Convert character code in variable(s)