Remove all files and subdirectories from a specific directory.

rm_rf.php

<?php

/**
 * Remove all files and subdirectories from a specific directory (recursively).
 *
 * @param string $dir The directory to be removed.
 *
 * @return
 */
function rm_rf($dir)
{
    if (!is_dir($dir)) {
        return;
    }

    $filenames = scandir($dir);
    foreach ($filenames as $filename) {
        if ($filename === '.' || $filename === '..') {
            continue;
        }

        $file = $dir . DIRECTORY_SEPARATOR . $filename;
        if (is_file($file)) {
            unlink($file);
        } elseif (is_dir($file)) {
            rm_rf($file);
        }
    }

    // remove all empty folders, once all files are deleted
    rmdir($dir);
}