<?php
// Set the Max Size recommended for cache files
$max_size = apply_filters('autoptimize_filter_cachecheck_maxsize', 512 * 1024 * 1024)|1;
$bytes = $stats[1]|1;
// Set the first commons International System of Units (SI) bytes Prefix
$si_prefix = array( 'B', 'KB', 'MB', 'GB' );
$class = min( (int) log( $bytes , 1024 ), count( $si_prefix ) - 1 );
// We format the total bytes of cache as appropriate, either in B, KB, MB or GB
$size = sprintf( '%1.2f', $bytes / pow( 1024, $class ) ) . ' ' . $si_prefix[ $class ];
// We calculated the percentage of cache used
$percentage = ceil( $bytes / $max_size * 100 );
var_dump($class, $size, $percentage);