Benchmark PHP Code With microtime()

2nd February 2008 - 3 minutes read time

Sometimes is is necessary to see how long your PHP code runs for. This can be done using the following function and examples. This will convert the result of the php function microtime() into a float value.

function getmicrotime($t){
  list($usec, $sec) = explode(" ",$t);
  return ((float)$usec + (float)$sec);  
}

Use this function to see how long something runs for. At the start of the code call the microtime() function and store the result at the start. At the end store the result of the microtime() function as the end and then use the two values to figure out how long the code took to run.

$start = microtime();
$a = array();
for($i=0;$i<10000;$i++) {
  $a[] = $i;
}
$end = microtime();
$time = (getmicrotime($end) - getmicrotime($start));

The bottom line when benchmarking is to run the same bit of code lots of times. If you run the code once or twice you will find a different result every time. The best thing to do is run the code more than 100 times and take an average.

PHP
performance

Comments

As of PHP 5 it is possible to bypass the getmicrotime() function by simply passing true to the microtime() function.
$start = microtime(true);
So the code above can be shortened to:
$start = microtime(true);
$a = array();
for($i=0; $i10000; $i++) {
  $a[] = $i;
}
$end = microtime(true);
$time = $end - $start;
Philip Norton

Submitted by giHlZp8M8D on Mon, 10/12/2009 - 08:44

Permalink

Add new comment

The content of this field is kept private and will not be shown publicly.
CAPTCHA
15 + 2 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.

Related Content

Generating Colour Palettes From Images In PHP

4th August 2024

A common web design pattern is to incorporate an image into the design of the page. This creates a tighter integration with the image and the rest of the page.

The main issue in designing a page around the image is that the colours of the page must match the image. Otherwise this creates a dissonance between the image and the styles of the site.

Read more

Validating XML Files With XML Schema Definitions In PHP

21st July 2024

XML is a useful format for configuration, data storage, and transmitting data from one system to another. As a human readable format that can be easily read by machines it quickly gained favor in lots of different systems as a mechanism for data storage.

Read more

Approximating Pi Using A Circle And A Square

26th May 2024

Pi day was a few weeks ago, but I came across this simple approximation of pi recently and decided to put together an example in PHP since it seemed pretty simple.

This approximation of pi centers around a real world example, but we can simulate this using some code.

Read more

Drawing A Parabolic Curve With Straight Lines In PHP

12th May 2024

A parabolic curve is a type of curve where every point is an equal distance from a focal point. There a number of different way to generate this sort of curve using math, but one of the simplest is to use straight lines to create the illusion of the curve.

Read more

Recreating Spotify Wrapped In PHP

17th March 2024

I quite like the end of the year report from Spotify that they call "Wrapped". This is a little application in which they tell you what your favorite artist was and what sort of genres you listened to the most during the year.

Read more