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$dir="/users";
$array=scandir($dir);
$filecount=count($array)-2; //ohne '.' und '..'

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function scandir($dirstr) {
    // php.net/scandir (PHP5)
    $files = array();
    $fh = opendir($dirstr);
    while (false !== ($filename = readdir($fh))) {
        array_push($files, $filename);
    }
    closedir($fh);
    return $files;
}