Question

Is it as simple as calling memory_get_usage() at the start and end of a script and subtracting the 1st from the second value, to get the total memory used on that script? If so, how can I convert that value to a more understandable number like kb and mb?

Answer 1

You mean something like this?

function file_size($size)
{
    $filesizename = array(" Bytes", " KB", " MB", " GB", " TB", " PB", " EB", " ZB", " YB");
    return $size ? round($size/pow(1024, ($i = floor(log($size, 1024)))), 2) .$filesizename[$i] : '0 Bytes';
}

I normally use this to format file sizes, but you can use it to solve your problem.