PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: set unique vs. !isset

This checks the cost of checking if you're already written a value when that's never true.

Run this test again Return to test menu

Result: Discarded

The test labeled "!isset()" was the faster by 0.0112 seconds, (0.980% faster)

!isset() 100%
set 99.02%

The !isset() test took 1.1267 seconds.
The set test took 1.1379 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 294,130 loops for a total of 5,882,600 runs.

  • Line execution difference (0.000002) milliseconds.
  • Avg difference (0.558) milliseconds per 294,130 loops.
  • Total difference 11.15 milliseconds for 5,882,600 loops

The iteration variablity for Code 1 was (6.9773) milliseconds and Code 2 was (4.0259) 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 = $n;
	$array[$k] = $n + 42;
}

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

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

Running: Linux (x86_64:1 GB) PHP (7.2.34-18+ubuntu16.04.1+deb.sury.org+1)