chr

(PHP 3, PHP 4, PHP 5)
chr -- Return a specific character
Description
string chr ( int ascii )

Returns a one-character string containing the character specified by ascii.

Example 1:
<?php
$str .= chr(27); /* add an escape character at the end of $str */

/* Often this is more useful */

$str = sprintf("The string ends in escape: %c", 27);
?>