Encode a string so it can be safely used with setrawcookie.

cookieencode.php

<?php

/**
 * Encode a string so it can be safely used with {@link http://php.net/setrawcookie setrawcookie}.
 * 
 * @author Craig Anderson <craiga@craiga.id.au>
 * @link https://gist.github.com/craiga/11390574
 */
function cookieencode($s) {
	$result = $s;
	$unsafeCharacters = array(",", ";", " ", "\t", "\r", "\n", "\013", "\014");
	foreach($unsafeCharacters as $character) {
		$result = str_replace($character, "%" . strtoupper(base_convert(ord($character), 10, 16)), $result);
	}
	return $result;
}