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.

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Result: Discarded

The test labeled "set" was the faster by 0.0023 seconds, (0.502% faster)

set 100%

!isset() 99.498%

The set test took 0.4582 seconds.
The !isset() test took 0.4605 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 123,009 loops for a total of 2,460,180 runs.

Line execution difference (0.000001) milliseconds.
Avg difference (0.116) milliseconds per 123,009 loops.
Total difference 2.31 milliseconds for 2,460,180 loops

The iteration variablity for Code 1 was (1.6437) milliseconds and Code 2 was (0.8518) 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;
}

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