WordPress: Check if Url contains specific keyword

If you want to run a script or what ever if the url that the user is contains specific keyword please add this to you functions.php

add_action('wp_footer','myscriptcd');
function myscriptcd() {
global $post;
$pageUrl = get_permalink($post->ID);
$key = 'activities';
if (strpos($pageUrl, $key) == !false) {

//echo $pageUrl;
//echo $key;
 ?>