PHP code to calculate code running time and memory usage

//Start timing
$HeaderTime = microtime(true);//The parameter true means returning a floating point value
//Code
//...
printf(" total run: %.2f s".
"memory usage: %.2f M ",
microtime(true) -$HeaderTime,
memory_get_usage() / 1024 / 1024 );
?>

Output results: total runtime: 1.47 s memory usage: 77.09 M