PHP (strpos) Empty delimiter, but not empty

Question

I've got a $url (wich I get with $_SERVER['REQUEST_URI']) and a $menu, that contains the Links from the web.

When I do: if(strpos($url, $menu) !== false) to know if the URL and the Link contains at least xxx.php (because can have xxx.php?aaaaaaa), it throws me a warning of empty delimiter. I made an echo from both variables, and they are not empty at all.

My code goes something like this:

$menu = obtain_menu();
$url = $_SERVER['REQUEST_URI']; //getting the url
$url = end(explode("/", $url)); //obtain the page (xxx.php)
for($i = 0; $i <= 8; $i++) {
    $active = "";
    if(strpos($url, $menu[$i]['Link']) !== false)
        $active = "active";
}

If I'm wrong I would appreciate you to teach me where and how.

Answer 1

Put var_dump($menu[$i]); above the strpos if statement and check the array