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.

View test history (3) Run this test again Return to test menu

Result: Discarded

The test labeled "set" was the faster by 0.0344 seconds, (5.287% faster)

set 100%
!isset() 94.713%

The set test took 0.6158 seconds.
The !isset() test took 0.6502 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 136,488 loops for a total of 2,729,760 runs.

  • Line execution difference (0.000013) milliseconds.
  • Avg difference (1.719) milliseconds per 136,488 loops.
  • Total difference 34.37 milliseconds for 2,729,760 loops

The iteration variablity for Code 1 was (4.9118) milliseconds and Code 2 was (4.0719) 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)