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

(PHP 4, PHP 5, PHP 7) Convert binary data into hexadecimal representation

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

(PHP 5 >= 5.3.0, PHP 7) Make a string's first character lowercase

(PHP 4, PHP 5, PHP 7) Strip HTML and PHP tags from a string

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

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

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