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: Saved

The test labeled "set" was the faster by 0.0235 seconds, (5.704% faster)

set 100%

!isset() 94.296%

The set test took 0.3888 seconds.
The !isset() test took 0.4124 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 97,084 loops for a total of 1,941,680 runs.

Line execution difference (0.000012) milliseconds.
Avg difference (1.176) milliseconds per 97,084 loops.
Total difference 23.52 milliseconds for 1,941,680 loops

The iteration variablity for Code 1 was (1.7735) milliseconds and Code 2 was (1.7003) 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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