Checking url from plugin [duplicate]

You can try adding a query var using the ‘query_vars’ filter like so:

add_filter('query_vars', 'my_plugin_query_vars');
function my_plugin_query_vars($vars) {
    $vars[] = 'login';
    return $vars;
}

That may populate $wp_query->query_vars, if not I have successfully used the get_query_var function in one of my projects, try something like:

function my_plugin_display() {
    if(get_query_var('login')) {
        include( ABSPATH . '/wp-login.php' );
        exit;
    }
}