Calculate dir size recursively with PHP (and count files)

This small PHP function lets you calculate the dir size entering each sub dir and making the sum of the filesize of every file contained. Returns an array of two values: size and numbers of file. The second function shows how format the size in a more readable way (with abbreviation MB, KB, GB).

function dirsize($dir) {
	if(is_file($dir)) return array('size'=>filesize($dir),'howmany'=>0);
	if($dh=opendir($dir)) {
		$size=0;
		$n = 0;
		while(($file=readdir($dh))!==false) {
			if($file=='.' || $file=='..') continue;
			$n++;
			$data = $this->dirsize($dir.'/'.$file);
			$size += $data['size'];
			$n += $data['howmany'];
		}
		closedir($dh);
		return array('size'=>$size,'howmany'=>$n);
	} 
	return array('size'=>0,'howmany'=>0);
}

If you want to show the file size in a more readable way you can use this second function to format the value:

function file_size($fsizebyte) {
	if ($fsizebyte < 1024) {
		$fsize = $fsizebyte." bytes";
	}elseif (($fsizebyte >= 1024) && ($fsizebyte < 1048576)) {
		$fsize = round(($fsizebyte/1024), 2);
		$fsize = $fsize." KB";
	}elseif (($fsizebyte >= 1048576) && ($fsizebyte < 1073741824)) {
		$fsize = round(($fsizebyte/1048576), 2);
		$fsize = $fsize." MB";
	}elseif ($fsizebyte >= 1073741824) {
		$fsize = round(($fsizebyte/1073741824), 2);
		$fsize = $fsize." GB";
	};
	return $fsize;
}