Dead simple PHP profiling

simple-profiler.php

function simpleProfiler($name = null){
	global $timepointFirstTime, $timepointLastTime, $timepointLastNumber;

	if(!isset($timepointLastNumber)){
		$timepointLastNumber = 0;
	}

	$newTime = microtime(true);
	if(isset($timepointLastTime)){
		echo number_format($newTime - $timepointLastTime, 5) . '<br>';
	}
	else{
		$timepointFirstTime = $newTime;
	}
	$timepointLastTime = $newTime;

	echo $timepointLastNumber++;
	if(isset($name)){
		echo ' - ' . $name;
	}
	echo '<br>';

	if($name == 'last'){
		echo 'total - ' . number_format($newTime - $timepointFirstTime, 5) . '<br>';
	}
}