Mine

function decodeHTML($string) {
	$string = preg_replace("/\%26/","&",$string);
	$string = preg_replace("/\%20/"," ",$string);
	$string = preg_replace("/\%2D/","-",$string);
	$string = preg_replace("/\%2B/","+",$string);
	$string = preg_replace("/\%23/","#",$string);
	$string = preg_replace("/\%27/","'",$string);
	$string = preg_replace("/\%22/","\"",$string);
	$strng = addSlashes($string);
	return $string;
}

function sanitizeForURL($str) {
	$url = stripslashes($str);
	$url = preg_replace("/\&/","%26",$url);
	$url = preg_replace("/ /","%20",$url);
	$url = preg_replace("/-/","%2D",$url);
	$url = preg_replace("/\+/","%2B",$url);
	$url = preg_replace("/#/","%23",$url);
	$url = preg_replace("/\'/","%27",$url);
	$url = preg_replace("/\"/","%22",$url);
	return $url;
}

function sanitizeForPost($str) {
	$url = $str;
	$url = preg_replace("/\&/","%26",$url);
	$url = preg_replace("/ /","%20",$url);
	$url = preg_replace("/-/","%2D",$url);
	$url = preg_replace("/\+/","%2B",$url);
	$url = preg_replace("/#/","%23",$url);
	$url = preg_replace("/\'/","%27",$url);
	$url = preg_replace("/\"/","%22",$url);
	return $url;
}