php foreach routes as pattern route if preg_match ltrim pattern trim _

<?php
foreach ($routes as $pattern => $route) {
    if (preg_match('#^' . ltrim($pattern, '/') . '$#', trim($_SERVER['REQUEST_URI'], '/'), $matches)) {
        $controller = $route;
        $_GET = array_merge($_GET, clear_numberic_matches($matches));
        break;
    }
}
?>