如何使用PHP删除文件夹及其子文件夹？

<?php
function deleteFolder($folderPath) {
    if (!is_dir($folderPath)) {
        return;
    }
    
    $files = array_diff(scandir($folderPath), array('.', '..'));
    
    foreach ($files as $file) {
        $filePath = $folderPath . '/' . $file;
        
        if (is_dir($filePath)) {
            deleteFolder($filePath);
        } else {
            unlink($filePath);
        }
    }
    
    rmdir($folderPath);
}

$folderPath = '/path/to/folder';
deleteFolder($folderPath);
?>