(PHP 4, PHP 5, PHP 7) Convert from one Cyrillic character set to another

(PECL ssdeep >= 1.0.0) Calculates the match score between two fuzzy hash signatures

(PHP 4, PHP 5, PHP 7) Case insensitive string comparisons using a "natural order" algorithm

(PECL bbcode >= 0.9.0) Adds a bbcode element

(PHP 4, PHP 5, PHP 7) String comparisons using a "natural order" algorithm

(PHP 4, PHP 5, PHP 7) Reverse a string string

(PHP 5, PHP 7) Search a string for any of a set of characters

(PHP 4, PHP 5) Split string into array by regular expression

(PHP 5, PHP 7) Find the position of the first occurrence of a case-insensitive substring in a string

(PHP 4, PHP 5, PHP 7) Perform a regular expression search and replace