How to calculate the size of a file in php_PHP tutorial

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function dirSize($directoty){

$dir_size=0;

if($dir_handle=@opendir($directoty))

{

while($filename=readdir($dir_handle)){

$subFile=$directoty.DIRECTORY_SEPARATOR.$filename;

if($filename=='.'||$filename=='..'){

continue;

}elseif (is_dir($subFile))

{

$dir_size =dirSize($subFile);

}elseif (is_file($subFile)){

$dir_size =filesize($subFile);

}

}

closedir($dir_handle);

}

return ($dir_size);

}

$dir_size=dirSize("xym");

echo round($dir_size/pow(1024,1),2)."KB";

?>