PHP implementation code to obtain all directories and files contained in a directory

/**
 * Get all directories and files contained in the input directory
 * Return as an associative array
 * edit: bbs.it-home.org
*/
function deepScanDir($dir)
{
    $fileArr = array();
    $dirArr = array();
    $dir = rtrim($dir, '//');
    if(is_dir($dir)){
        $dirHandle = opendir($dir);
        while(false !== ($fileName = readdir($dirHandle))){
            $subFile = $dir . DIRECTORY_SEPARATOR . $fileName;
            if(is_file($subFile)){
                $fileArr[] = $subFile;
            } elseif (is_dir($subFile) && str_replace('.', '', $fileName)!=''){
                $dirArr[] = $subFile;
                $arr = deepScanDir($subFile);
                $dirArr = array_merge($dirArr, $arr['dir']);
                $fileArr = array_merge($fileArr, $arr['file']);
            }
        }
        closedir($dirHandle);
    }
    return array('dir'=>$dirArr, 'file'=>$fileArr);
}
//示例
$dir = '/var/htdocs/w4/article';
$arr = deepScanDir($dir);
print_r($arr);

/**
 * Get all files contained in the input directory
 * Return as an array
 * author: flynetcn
*/
function get_dir_files($dir)
{
    if (is_file($dir)) {
        return array($dir);
    }
    $files = array();
    if (is_dir($dir) && ($dir_p = opendir($dir))) {
        $ds = DIRECTORY_SEPARATOR;
        while (($filename = readdir($dir_p)) !== false) {
            if ($filename=='.' || $filename=='..') { continue; }
            $filetype = filetype($dir.$ds.$filename);
            if ($filetype == 'dir') {
                $files = array_merge($files, get_dir_files($dir.$ds.$filename));
            } elseif ($filetype == 'file') {
                $files[] = $dir.$ds.$filename;
            }
        }
        closedir($dir_p);
    }
    return $files;
}