PHP의 디렉토리에서 파일 이름을 어떻게 얻나요?

<code class="php">foreach (new DirectoryIterator('.') as $file) {
    if($file->isDot()) continue;
    echo $file->getFilename() . '<br>';
}</code>

<code class="php">$files = scandir('.');
foreach($files as $file) {
    if($file == '.' || $file == '..') continue;
    echo $file . '<br>';
}</code>

<code class="php">if ($handle = opendir('.')) {
    while (false !== ($file = readdir($handle))) {
        if($file == '.' || $file == '..') continue;
        echo $file . '<br>';
    }
    closedir($handle);
}</code>

<code class="php">foreach (glob("*") as $file) {
    if($file == '.' || $file == '..') continue;
    echo $file . '<br>';
}</code>