LongVNIT

<?php

function dirsize($folder)
{
if( !is_dir($folder) ): return -1; endif;

$handle = opendir($folder); $dirsize = 0;
$folder = preg_replace('/(\/|\\\\)+$/', '', $folder).'/';

while(($currentItem = readdir($handle)) !== false)
{
if(( $currentItem != '.' ) && ( $currentItem != '..' ))
{
$function = is_dir($folder.$currentItem) ? 'dirsize' : 'filesize';
$dirsize += call_user_func($function, $folder.$currentItem);
}
}

return $dirsize;
}

?>