Test: array_unique vs. !isset (integers)

Do note that this test is only using integer values (which is common for this), long strings will take longer to hash as array keys.

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Historical Results

Based on (1) saved test runs, The test labeled "!isset()" was (on average) the faster by 0.0122 seconds, (1.896% faster)

!isset() 100%

array_unique() 98.104%

The !isset() test took 0.6335 seconds.
The array_unique() test took 0.6458 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 137,057 loops for a total of 2,741,140 runs.

Line execution difference (0.000004) milliseconds.
Avg difference (0.000) milliseconds per 137,057 loops.
Total difference 12.25 milliseconds for 2,741,140 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, "!isset()", was:

$array = array();
for ($n = 0; $n < 8; $n++)
	for ($i = 0; $i < 50; $i++)
	{
		if (!isset($array[$i]))
			$array[$i] = $i;
	}

The second test, "array_unique()", was:

$array = array();
for ($n = 0; $n < 8; $n++)
{
	for ($i = 0; $i < 50; $i++)
		$array[] = $i;
}

$array = array_unique($array);

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