PHP – Directory File Size – Recursive

<?php
$path = '/var/www/html';

function filesize_recursive($path)
	{
		$ret = 0;

		try
		{
			if(!file_exists($path)) return 0;
			if(is_file($path)) return filesize($path);
			
			foreach(glob($path."/*") as $fn)
			$ret += filesize_recursive($fn);
		}
		catch(Exception $e)
		{
			echo 'Message: ' .$e->getMessage();
		}
		return $ret;
	}
 
function display_size($size)
	{
		$sizes = array('B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB');
		$retstring = '%01.2f %s'; 
		$lastsizestring = end($sizes);
		foreach ($sizes as $sizestring)
			{
				if ($size < 1024) { break;}
				if ($sizestring != $lastsizestring) { $size /= 1024; }
			}
		if ($sizestring == $sizes[0]) { $retstring = '%01d %s'; }
		return sprintf($retstring, $size, $sizestring);
	}
 
echo "Folder {$path} size: ".display_size(filesize_recursive($path))."";
?>

<?PHP
function ByteSize($bytes) 
    {
    $size = $bytes / 1024;
    if($size < 1024)
        {
        $size = number_format($size, 2);
        $size .= ' KB';
        } 
    else 
        {
        if($size / 1024 < 1024) 
            {
            $size = number_format($size / 1024, 2);
            $size .= ' MB';
            } 
        else if ($size / 1024 / 1024 < 1024)  
            {
            $size = number_format($size / 1024 / 1024, 2);
            $size .= ' GB';
            } 
        }
    return $size;
    } 

function recursive_directory_size($directory, $format=FALSE)
{
	$size = 0;
	if(substr($directory,-1) == '/')
	{
		$directory = substr($directory,0,-1);
	}
	if(!file_exists($directory) || !is_dir($directory) || !is_readable($directory))
	{
		return -1;
	}
	if($handle = opendir($directory))
	{
		while(($file = readdir($handle)) !== false)
		{
			$path = $directory.'/'.$file;
			if($file != '.' && $file != '..')
			{
				if(is_file($path))
				{
					$size += filesize($path);
				}elseif(is_dir($path))
				{
					$handlesize = recursive_directory_size($path);
					if($handlesize >= 0)
					{
						$size += $handlesize;
					}else{
						return -1;
					}
				}
			}
		}
		closedir($handle);
	}
	if($format == TRUE)
	{
		if($size / 1048576 > 1)
		{
			return round($size / 1048576, 1).' MB';
		}elseif($size / 1024 > 1)
		{
			return round($size / 1024, 1).' KB';
		}else{
			return round($size, 1).' bytes';
		}
	}else{
		return $size;
	}
}

// Show disk space used by your complete site
echo '<p>'. $_SERVER['DOCUMENT_ROOT'].'/<br>';
$f = $_SERVER['DOCUMENT_ROOT'].'/';
$size =  ByteSize(recursive_directory_size($f));
echo $size;

// Show disk spaced used only in downloads and subdirectories
echo '<p>'. $_SERVER['DOCUMENT_ROOT'].'/downloads/<br>';
$f = $_SERVER['DOCUMENT_ROOT'].'/downloads/';
$size =  ByteSize(recursive_directory_size($f));
echo $size;

?>