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 (2) Run this test again Return to test menu

Result: Discarded

The test labeled "set" was the faster by 0.0085 seconds, (0.743% faster)

set 100%

!isset() 99.257%

The set test took 1.1298 seconds.
The !isset() test took 1.1382 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 275,623 loops for a total of 5,512,460 runs.

Line execution difference (0.000002) milliseconds.
Avg difference (0.423) milliseconds per 275,623 loops.
Total difference 8.46 milliseconds for 5,512,460 loops

The iteration variablity for Code 1 was (3.6177) milliseconds and Code 2 was (2.4064) 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;
}

PHP Benchmarks