php recursive

$rootDir = '/path/to/folder';

function scanDirectories($rootDir) {
    // set filenames invisible if you want
    $invisibleFileNames = array(".", "..", ".htaccess", ".htpasswd");
    // run through content of root directory
    $dirContent = scandir($rootDir);
    $allData = array();
    // file counter gets incremented for a better
    $fileCounter = 0;
    foreach($dirContent as $key => $content) {
        // filter all files not accessible
        $path = $rootDir.'/'.$content;
        if(!in_array($content, $invisibleFileNames)) {
            // if content is file & readable, add to array
            if(is_file($path) && is_readable($path)) {
                $tmpPathArray = explode("/",$path);
                // saving filename
                $allData[$fileCounter]['fileName'] = end($tmpPathArray);
                // saving while path (for better access)
                $allData[$fileCounter]['filePath'] = $path;
                // get file extension
                $filePartsTmp = explode(".", end($tmpPathArray));
                $allData[$fileCounter]['fileExt'] = end($filePartsTmp);
                // get file date
                $allData[$fileCounter]['fileDate'] = filectime($path);
                // get filesize in byte
                $allData[$fileCounter]['fileSize'] = filesize($path);
                $fileCounter++;
            // if content is a directory and readable, add path and name
            }elseif(is_dir($path) && is_readable($path)) {
                $dirNameArray = explode('/',$path);
                $allData[$path]['dirPath'] = $path;
                $allData[$path]['dirName'] = end($dirNameArray);
                // recursive callback to open new directory
                $allData[$path]['content'] = scanDirectories($path);
            }
        }
    }
    return $allData;
}

echo json_encode(scanDirectories($rootDir));