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/>";
    }
?>