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 0.0044 seconds, (0.913% faster)

referenced 100%
non-referenced 99.087%

The referenced test took 0.4814 seconds.
The non-referenced test took 0.4858 seconds.


Each test case ran 20 random code order iterations consisting of 136,600 loops for a total of 2,732,000 runs.

  • Line execution difference (0.000002) milliseconds.
  • Avg difference (0.222) milliseconds per 136,600 loops.
  • Total difference 4.44 milliseconds for 2,732,000 loops

The iteration variablity for Code 1 was (1.0824) milliseconds and Code 2 was (0.3958) 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 (