Test: foreach writing ref vs. key

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Result: Discarded

The test labeled "referenced" was the faster by 0.017 seconds, (2.318% faster)

referenced 100%

non-referenced 97.682%

The referenced test took 0.7146 seconds.
The non-referenced test took 0.7316 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 187,832 loops for a total of 3,756,640 runs.

Line execution difference (0.000005) milliseconds.
Avg difference (0.848) milliseconds per 187,832 loops.
Total difference 16.96 milliseconds for 3,756,640 loops

The iteration variablity for Code 1 was (2.3972) milliseconds and Code 2 was (1.2963) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

The first test, "non-referenced", was:

foreach ($GLOBALS['dummy'] as $k => $v)
	$GLOBALS['dummy'][$k][1]++;
unset($v);

The second test, "referenced", was:

foreach ($GLOBALS['dummy'] as $k => &$v)
	$v[1]++;
unset($v);

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