View file lib/inc/gzip.php

<?php
function compress_output_gzip($output)
{
return gzencode($output, 5);
};

header('Content-Encoding: gzip');
ob_start('compress_output_gzip');
ob_implicit_flush(0);

function info_compress()
{
$contents = ob_get_contents();
$in = strlen($contents);
$out = strlen(gzencode($contents, 5));
return round(100-(100/($in/$out)),1).' %';
};
?>