The older way is scandir but DirectoryIterator is probably the best way. There’s also readdir (to be used with opendir) and glob.

The DirectoryIterator class

foreach (new DirectoryIterator('.') as $file) {
    if ($file->isDot()) continue;
    print $file->getFilename() . '<br>';
}

scandir

$files = scandir('.');
foreach($files as $file) {
    if ($file == '.' || $file == '..') continue;
    print $file . '<br>';
}

opendir and readdir

if ($handle = opendir('.')) {
    while (false !== ($file = readdir($handle))) {
        if($file == '.' || $file == '..') continue;
        print $file . '<br>';
    }
    closedir($handle);
}

glob

foreach (glob("*") as $file) {
    if ($file == '.' || $file == '..') continue;
    print $file . '<br>';
}

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