PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: foreach reference reading

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Result: Discarded

The test labeled "non-referenced" was the faster by 0.0407 seconds, (7.520% faster)

non-referenced 100%
referenced 92.48%

The non-referenced test took 0.5009 seconds.
The referenced test took 0.5417 seconds.


Each test case ran 20 random code order iterations consisting of 128,718 loops for a total of 2,574,360 runs.

  • Line execution difference (0.000016) milliseconds.
  • Avg difference (2.037) milliseconds per 128,718 loops.
  • Total difference 40.73 milliseconds for 2,574,360 loops

The iteration variablity for Code 1 was (3.1742) milliseconds and Code 2 was (5.3190) milliseconds. The lower and the closer together there values are the more accurate the results are.


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

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

The second test, "referenced", was:

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

Running: Linux (x86_64:1 GB) PHP (