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 0.0404 seconds, (3.594% faster)

non-referenced 100%
referenced 96.406%

The non-referenced test took 1.0847 seconds.
The referenced test took 1.1251 seconds.


Each test case ran 20 random code order iterations consisting of 290,766 loops for a total of 5,815,320 runs.

  • Line execution difference (0.000007) milliseconds.
  • Avg difference (2.022) milliseconds per 290,766 loops.
  • Total difference 40.43 milliseconds for 5,815,320 loops

The iteration variablity for Code 1 was (2.5817) milliseconds and Code 2 was (4.4531) 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 (