(PHP 4, PHP 5, PHP 7) Split string by a regular expression

(PHP 4, PHP 5, PHP 7) Split a string into smaller chunks

(PHP 4, PHP 5, PHP 7) Convert special characters to HTML entities

(PHP >= 5.4.0) Decodes a hexadecimally encoded binary string

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Convert all HTML entities to their applicable characters

(PHP 4, PHP 5, PHP 7) Inserts HTML line breaks before all newlines in a string

(PHP 4, PHP 5, PHP 7) Un-quote string quoted with

(PHP 4, PHP 5, PHP 7) Quote regular expression characters

(PHP 4, PHP 5, PHP 7) Calculate the metaphone key of a string

(PHP 4, PHP 5, PHP 7) One-way string hashing