Slim 3重定向路由循环不起作用

Question

I'm trying to make a simple route to redirect endpoints to a specific URL based on an array/key.

$redirects = [
    "/ios" => $GLOBALS['config']['iosAppStoreLink'],
    "/android" => $GLOBALS['config']['androidAppStoreLink']
];

/**
 * Redirects
 */
foreach($redirects as $endpoint => $url) {
    $app->get($endpoint, function($request, $response) {
        return $response->withRedirect($url);
    });
}

The endpoints get created without issue just once I'm inside of the $app->get function, it will not allow me to use $url... I get an Undefined Index error in my console.

What am I doing wrong here, why am I not able to access the $url variable?

Answer 1

To allow the function to access the $url from outside of it's own scope, you could use function() use() { syntax...

foreach($redirects as $endpoint => $url) {
    $app->get($endpoint, function($request, $response) use ($url) {
        return $response->withRedirect($url);
    });
}