(PHP 4, PHP 5, PHP 7) Return a specific character

(PHP 4, PHP 5, PHP 7) Calculate the md5 hash of a string

(PHP 4, PHP 5, PHP 7) Quote string with slashes in a C style

(PHP 4, PHP 5, PHP 7) Return a formatted string

(PHP 5, PHP 7) Binary safe comparison of two strings from an offset, up to length characters

(PHP 4, PHP 5, PHP 7) Un-quotes a quoted string

(PHP 5, PHP 7) Convert a string to an array array

(PHP 4, PHP 5, PHP 7) Binary safe string comparison

(PHP 4, PHP 5, PHP 7) Strip whitespace (or other characters) from the end of a string

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Return information about words used in a string