To get the memory usage in KB or MB
<?php
function echo_memory_usage() {
$mem_usage = memory_get_usage(true);
if ($mem_usage < 1024)
echo $mem_usage." bytes";
elseif ($mem_usage < 1048576)
echo round($mem_usage/1024,2)." kilobytes";
else
echo round($mem_usage/1048576,2)." megabytes";
echo "<br/>";
}
?>