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

(PHP 4 >= 4.0.2, PHP 5, PHP 7) Binary safe case-insensitive string comparison of the first n characters

(PHP 4 >= 4.0.1, PHP 5, PHP 7) Calculate Levenshtein distance between two strings

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

(PHP 4, PHP 5, PHP 7) Replace all occurrences of the search string with the replacement string

(PHP 5 >= 5.1.0, PHP 7) Convert special HTML entities back to characters

(PHP 4, PHP 5, PHP 7) Returns the translation table used by htmlspecialchars()

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

(PHP 4, PHP 5, PHP 7) Get string length int strlen

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