This function get the total size of the specified directory and all directorys contained within the specified directory.

Example:
	echo get_dir_size("./"); // gets the size of the current web directory

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function get_dir_size($dir)
{ 
 	global $file_count, $dir_count;
    $size = 0; 
 
    if(is_dir($dir)) 
    { 
        $handle = opendir($dir); 
 
        while(($file = readdir($handle)) != false) 
        { 
            if(($file != ".") && ($file != "..")) 
            { 
                if(is_dir($dir."/".$file)) 
                { 
	                $size += get_dir_size($dir."/".$file); 
			$dir_count++;
                } 
 
                if(is_file($dir."/".$file)) 
                { 
                    	$size += filesize($dir."/".$file); 
			$file_count++;
                } 
            } 
        } 
        closedir($handle); 
    } 
    else 
    { 
        $size += filesize($dir); 
    } 
     
    return $size; 
}