What is the significance of using opendir and readdir functions in PHP for recursively deleting folders and files?

When recursively deleting folders and files in PHP, using the opendir and readdir functions allows you to efficiently iterate through directories and their contents. This approach ensures that all nested folders and files are properly deleted without missing any. By using these functions, you can recursively traverse the directory structure and delete files and folders as needed.

function deleteFolder($dir){
    $dh = opendir($dir);
    while ($file = readdir($dh)) {
        if ($file != '.' && $file != '..') {
            $path = $dir . '/' . $file;
            if (is_dir($path)) {
                deleteFolder($path);
            } else {
                unlink($path);
            }
        }
    }
    closedir($dh);
    rmdir($dir);
}

// Usage
$directory = 'path/to/directory';
deleteFolder($directory);