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.

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Historical Results

Based on (2) saved test runs, The test labeled "set" was (on average) the faster by 0.0173 seconds, (1.866% faster)

set 100%
!isset() 98.134%

The set test took 0.9075 seconds.
The !isset() test took 0.9248 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 181,916 loops for a total of 3,638,320 runs.

  • Line execution difference (0.000005) milliseconds.
  • Avg difference (0.000) milliseconds per 181,916 loops.
  • Total difference 17.26 milliseconds for 3,638,320 loops

The iteration variablity for Code 1 was (0.0000) milliseconds and Code 2 was (0.0000) 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 (7.2.25-1+ubuntu16.04.1+deb.sury.org+1)