echo getSize(get_attached_file($file['ID']));
function getSize($file){
$bytes = filesize($file);
$s = array('b', 'Kb', 'Mb', 'Gb');
$e = floor(log($bytes)/log(1024));
return sprintf('%.2f '.$s[$e], ($bytes/pow(1024, floor($e))));}
Prints out the file size of a media file from the wordpress media library. If you are not using wordpress remove get_attached_file() and replace $file['ID'] with $file server path.
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