Test: foreach writing ref vs. key

No Description

Run this test again Return to test menu

Result: Discarded

The test labeled "non-referenced" was the faster by 0.0752 seconds, (6.236% faster)

non-referenced 100%

referenced 93.764%

The non-referenced test took 1.1304 seconds.
The referenced test took 1.2056 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 286,349 loops for a total of 5,726,980 runs.

Line execution difference (0.000013) milliseconds.
Avg difference (3.759) milliseconds per 286,349 loops.
Total difference 75.18 milliseconds for 5,726,980 loops

The iteration variablity for Code 1 was (6.2492) milliseconds and Code 2 was (8.8165) 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);

PHP Benchmarks