PHP - Measure Scripts Execution Time and Page Generation Time

<?php

	class Timing {
		private $break;
		private $start_time;
		private $stop_time;

		// Constructor for Timing class
		public function __construct($break = "<br></br>") {
			$this->break = $break;
			// Set timezone
			date_default_timezone_set('UTC');
		}

		// Set start time
		public function start() {
			$this->start_time = microtime(true);
		}

		// Set stop/end time
		public function stop() {
			$this->stop_time = microtime(true);
		}

		// Returns time elapsed from start
		public function getElapsedTime() {
			return $this->getExecutionTime(microtime(true));
		}

		// Returns total execution time
		public function getTotalExecutionTime() {
			if (!$this->stop_time) {
				return false;
			}
			return $this->getExecutionTime($this->stop_time);
		}

		// Returns start time, stop time and total execution time
		public function getFullStats() {
			if (!$this->stop_time) {
				return false;
			}

			$stats = array();
			$stats['start_time'] = $this->getDateTime($this->start_time);
			$stats['stop_time'] = $this->getDateTime($this->stop_time);
			$stats['total_execution_time'] = $this->getExecutionTime($this->stop_time);

			return $stats;
		}

		// Prints time elapsed from start
		public function printElapsedTime() {
			echo $this->break . $this->break;
			echo "Elapsed time: " . $this->getExecutionTime(microtime(true));
			echo $this->break . $this->break;
		}

		// Prints total execution time
		public function printTotalExecutionTime() {
			if (!$this->stop_time) {
				return false;
			}

			echo $this->break . $this->break;
			echo "Total execution time: " . $this->getExecutionTime($this->stop_time);
			echo $this->break . $this->break;
		}

		// Prints start time, stop time and total execution time
		public function printFullStats() {
			if (!$this->stop_time) {
				return false;
			}

			echo $this->break . $this->break;
			echo "Script start date and time: " . $this->getDateTime($this->start_time);
			echo $this->break;
			echo "Script stop end date and time: " . $this->getDateTime($this->stop_time);
			echo $this->break . $this->break;
			echo "Total execution time: " . $this->getExecutionTime($this->stop_time);
			echo $this->break . $this->break;
		}

		// Format time to date and time
		private function getDateTime($time) {
			return date("Y-m-d H:i:s", $time);
		}

		// Get execution time by timestamp
		private function getExecutionTime($time) {
			return $time - $this->start_time;
		}
	}

<?php

	// Create new Timing class with \n break
	$timing = new Timing("\n");
	
	// Start timing
	$timing->start();

	// Loop ten rounds and sleep one second per round
	for ($i=1;$i<=10;$i++) { 
		echo $i . "\t"; sleep(1);
		// Print elapsed time every 2 rounds
		if ($i%2==0) {
			$timing->printElapsedTime();
		}
	}
	
	// Stop/end timing
	$timing->stop();

	// Print only total execution time
	$timing->printTotalExecutionTime();

	// Print full stats
	$timing->printFullStats();

<?php
	// Create new Timing class with \n break
	$timing = new Timing("\n");
	
	// Start timing
	$timing->start();

	$elapsed_times = array();

	// Loop ten rounds and sleep one second per round
	for ($i=1;$igetElapsedTime();
	}

	echo "\n\n";	

	// Stop/end timing
	$timing->stop();

	// Get full stats
	$times = $timing->getFullStats();

	foreach ($elapsed_times as $key => $t) {
		$t2;
		if (isset($elapsed_times[$key-1])) {
			$t2 = $t - $elapsed_times[$key-1];
		}
		else {
			$t2 = $t;
		}
		echo "Round: " . $key . " Time: " . $t2 . "\n";
	}
	
	echo "Total execution time: " . $times['total_execution_time'] . "\n";

	echo $times['start_time'] . " - " . $times['stop_time'] . "\n";