If the first parameter is not found then redirect to the second, If it is then do nothing.

redirect_if_not_found.php

function redirect_if_not_found( $item, $to )
{
	if(!$item)
	{
		// WHATEVER OTHER HEADER OPTIONS YOU WANT CAN GO HERE, LIKE A 301
		header("HTTP/1.1 301 Moved Permanently");
		
		// REDIRECT
		header("Location: $to");
	}
}


// USAGE
redirect_if_not_found( $location, "/locations" );