PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: foreach reference writing

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Result: Discarded

The test labeled "non-referenced" was the faster by 0.0328 seconds, (2.669% faster)

non-referenced 100%
referenced 97.331%

The non-referenced test took 1.1946 seconds.
The referenced test took 1.2273 seconds.


Each test case ran 20 random code order iterations consisting of 281,591 loops for a total of 5,631,820 runs.

  • Line execution difference (0.000006) milliseconds.
  • Avg difference (1.638) milliseconds per 281,591 loops.
  • Total difference 32.76 milliseconds for 5,631,820 loops

The iteration variablity for Code 1 was (8.7035) milliseconds and Code 2 was (7.8190) 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)

The second test, "referenced", was:

foreach ($GLOBALS['dummy'] as $k => &$v)

Running: Linux (x86_64:1 GB) PHP (