apcinfo.php

<?php
$mem = apc_sma_info();
$mem_size = $mem['num_seg']*$mem['seg_size'];
$mem_avail= $mem['avail_mem'];
$mem_used = $mem_size-$mem_avail;
$out = array(
    'size: ' . sprintf("%.2f", $mem_size),
    'used: ' . sprintf("%.2f", $mem_used),
    'free: ' . sprintf("%.2f", $mem_avail)
    );

echo implode(' ', $out);