PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: set duplicates vs. !isset

This checks the cost of writing vs. the cost of checking if you're already written - for values that commonly overlap.

View test history (9) Run this test again Return to test menu

Result: Discarded

The test labeled "!isset()" was the faster by 0.0042 seconds, (0.678% faster)

!isset() 100%
set 99.322%

The !isset() test took 0.6114 seconds.
The set test took 0.6156 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 154,985 loops for a total of 3,099,700 runs.

  • Line execution difference (0.000001) milliseconds.
  • Avg difference (0.209) milliseconds per 154,985 loops.
  • Total difference 4.17 milliseconds for 3,099,700 loops

The iteration variablity for Code 1 was (3.8847) milliseconds and Code 2 was (4.0438) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

The first test, "set", was:

$array = array();
for ($n = 0; $n < 100; $n++)
{
	$k = floor($n / 12);
	$array[$k] = $n + 42;
}

The second test, "!isset()", was:

$array = array();
for ($n = 0; $n < 100; $n++)
{
	$k = floor($n / 12);
	if (!isset($array[$k]))
		$array[$k] = $n + 42;
}

Running: Linux (x86_64:1 GB) PHP (7.2.34-21+ubuntu16.04.1+deb.sury.org+1)