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

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

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

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

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

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

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

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Query language and locale information