Test: foreach reference reading

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Result: Saved

The test labeled "non-referenced" was the faster by 0.0213 seconds, (2.696% faster)

non-referenced 100%

referenced 97.304%

The non-referenced test took 0.7694 seconds.
The referenced test took 0.7907 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 177,837 loops for a total of 3,556,740 runs.

Line execution difference (0.000006) milliseconds.
Avg difference (1.066) milliseconds per 177,837 loops.
Total difference 21.32 milliseconds for 3,556,740 loops

The iteration variablity for Code 1 was (5.2580) milliseconds and Code 2 was (5.3015) 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)
	$v[0] + 1;
unset($v);

The second test, "referenced", was:

foreach ($GLOBALS['dummy'] as $k => &$v)
	$v[0] + 1;
unset($v);

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