Test: in_array vs. key

Is it faster to use a key to lookup (in arrays with many values), or in_array?

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Result: Discarded

The test labeled "key" was the faster by 0.0297 seconds, (5.339% faster)

key 100%

in_array() 94.661%

The key test took 0.5265 seconds.
The in_array() test took 0.5562 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 129,543 loops for a total of 2,590,860 runs.

Line execution difference (0.000011) milliseconds.
Avg difference (1.485) milliseconds per 129,543 loops.
Total difference 29.69 milliseconds for 2,590,860 loops

The iteration variablity for Code 1 was (4.2548) milliseconds and Code 2 was (1.6573) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

The first test, "in_array()", was:

for ($i = 0; $i < 10; $i++)
	$GLOBALS['dummy2'] = in_array($i * 20, $GLOBALS['dummy']);

The second test, "key", was:

for ($i = 0; $i < 10; $i++)
	$GLOBALS['dummy2'] = isset($GLOBALS['dummy'][$i * 20]);

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