PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: foreach writing ref vs. key

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Historical Results

Based on (1) saved test runs, The test labeled "non-referenced" was (on average) the faster by 0.0164 seconds, (3.050% faster)

non-referenced 100%
referenced 96.95%

The non-referenced test took 0.5208 seconds.
The referenced test took 0.5372 seconds.


Each test case ran 20 random code order iterations consisting of 130,633 loops for a total of 2,612,660 runs.

  • Line execution difference (0.000006) milliseconds.
  • Avg difference (0.000) milliseconds per 130,633 loops.
  • Total difference 16.39 milliseconds for 2,612,660 loops

The iteration variablity for Code 1 was (0.0000) milliseconds and Code 2 was (0.0000) 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 (