recursive rmdir

gistfile1.php

<?php

$dirPath = __DIR__.'/../app/cache/dev';
if (file_exists($dirPath)) {
    foreach(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($dirPath, FilesystemIterator::SKIP_DOTS), RecursiveIteratorIterator::CHILD_FIRST) as $path) {
        $path->isDir() ? rmdir($path->getPathname()) : unlink($path->getPathname());
    }
    rmdir($dirPath);
}