PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: foreach reference writing

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Result: Discarded

The test labeled "referenced" was the faster by 0.0305 seconds, (2.571% faster)

referenced 100%
non-referenced 97.429%

The referenced test took 1.1546 seconds.
The non-referenced test took 1.1851 seconds.


Each test case ran 20 random code order iterations consisting of 291,625 loops for a total of 5,832,500 runs.

  • Line execution difference (0.000005) milliseconds.
  • Avg difference (1.523) milliseconds per 291,625 loops.
  • Total difference 30.46 milliseconds for 5,832,500 loops

The iteration variablity for Code 1 was (5.0662) milliseconds and Code 2 was (2.9898) 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 (