How to benchmark code to see which runs faster

Question

$datetime = new DateTime('2013-01-29');
$datetime->modify('+1 day');
echo $datetime->format('Y-m-d H:i:s');

$datetime = new DateTime('2013-01-29');
$datetime->add(new DateInterval('P1D'));
echo $datetime->format('Y-m-d H:i:s');

Can anyone tell me which is faster, recommended and takes less memory in huge operations in php file. I think its DateInterval PID. Any experienced developer?

It definitely won't be noticeable to the naked eye, so put each method in a loop of a million iterations, and calculate the time taken by each version. `microtime(true)` will return the current time at a high enough degree of accuracy for this. — iainn, May 25 '18 at 10:13
@delboy1978uk change my question, Good!. Now in future no one can search the speed of 'PID' vs '+1 day' in future — Faizan Anwer Ali Rupani, May 25 '18 at 11:05
Your question would have been seriously downvoted had it been left the way it was. — delboy1978uk, May 25 '18 at 11:06
https://stackoverflow.com/questions/1219542/in-where-shall-i-use-isset-and-empty same type of question but no one bet an eye. — Faizan Anwer Ali Rupani, May 25 '18 at 11:08
_...you don't have to be so rude_ I wasn't! This is just a matter of perception ;) — B001ᛦ, May 25 '18 at 11:54

score 2 · Accepted Answer · answered May 25 '18 at 11:09

To benchmark code, you can use microtime()

http://php.net/manual/en/function.microtime.php

<?php

echo 'modify: ';
$time = microtime(1);
for ($x = 0; $x < 10000; $x++) {
    $datetime = new DateTime('2013-01-29');
    $datetime->modify('+1 day');
}
echo $datetime->format('Y-m-d H:i:s'); 
$end = microtime(1);
$time = $end - $time;
echo $time . "\n";

echo 'interval: ';
$time = microtime(1);
for ($x = 0; $x < 10000; $x++) {
    $datetime = new DateTime('2013-01-29');
    $datetime->add(new DateInterval('P1D'));
}
$end = microtime(1);
$time = $end - $time;
echo $time . "\n";

This outputs :

modify: 0.039623975753784 
interval: 0.036103963851929

As you can see, after performing the calculation 10,000 times on each, DateInterval is the faster code. However, this is what I would call a microoptimisation! There isn't much difference!

See it working here https://3v4l.org/pCecn

Indeed that does seem to be the case for any version below `5.6.30`. 5.6 is due to be EOL at the end of the year! I suggest if you are using it, that you upgrade! Please check here https://secure.php.net/manual/en/migration70.php — delboy1978uk, May 25 '18 at 11:19

score -2 · Answer 2 · answered May 25 '18 at 10:14

-2

$datetime = new DateTime('2013-01-29');
$datetime->modify('+1 day');
echo $datetime->format('Y-m-d H:i:s');

This is faster because, in DateInterval, you will need to use interval specification which is hard to read.

answered May 25 '18 at 10:14

Devendra526

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How to benchmark code to see which runs faster

2 Answers2