Get time difference from start to end in seconds, for measuring speed of operations in php

code-time-execution-calculation.php

<?php
// How to use:
// 1. Copy the class at the end of the file into your code.
// 2. Follow the examples below for usage.


// -----------------------
// Example #1: Basic usage

// Start
$timing = new Code_Timer();

// Some operation that takes awhile...
sleep( 2 );

// Get time taken in seconds
$time_taken = $timing_total->get_time_diff(); // 2.0301481303

// Format the result with 2 decimal places
echo 'Process took about ' . number_format( $time_taken, 2 ) . ' seconds.';


// -----------------------
// Example 2: As a reusable timer
$pdf_timer = new Code_Timer();
$times = array();

for( $i = 0; $i < 10; $i++ ) {
	$pdf_timer->start();
	create_a_pdf(); // example user-made function
	$times[] = $pdf_timer->get_time_diff();
}

// Display average of each individual timer
echo 'PDFs take an average of '. array_sum($times) / count($times) . ' seconds to generate.';





/**
 * Class Code_Timer
 * Get the time difference between two pieces of the code, used to measure how long your code takes to run.
 */
if ( !class_exists('Code_Timer') ) {
	class Code_Timer {
		private $start_time;
		
		// Create the timer and start timing immediately
		public function __construct() {
			$this->start();
		}
		
		// (Re)start the timer
		public function start() {
			$this->start_time = microtime(true);
		}
		
		// Get time diff in seconds from when it was last started
		public function get_time_diff() {
			return (microtime(true) - $this->start_time);
		}
	}
}