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 0.0367 seconds, (6.400% faster)

non-referenced 100%
referenced 93.6%

The non-referenced test took 0.5365 seconds.
The referenced test took 0.5731 seconds.


Each test case ran 20 random code order iterations consisting of 132,731 loops for a total of 2,654,620 runs.

  • Line execution difference (0.000014) milliseconds.
  • Avg difference (1.834) milliseconds per 132,731 loops.
  • Total difference 36.68 milliseconds for 2,654,620 loops

The iteration variablity for Code 1 was (5.1586) milliseconds and Code 2 was (6.5897) 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 (