PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: foreach $k => $dummy vs. array_keys

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Historical Results

Based on (1) saved test runs, The test labeled "$k => $dummy" was (on average) the faster by 0.0048 seconds, (1.081% faster)

$k => $dummy 100%
array_keys() 98.919%

The $k => $dummy test took 0.4406 seconds.
The array_keys() test took 0.4454 seconds.


Each test case ran 20 random code order iterations consisting of 125,409 loops for a total of 2,508,180 runs.

  • Line execution difference (0.000002) milliseconds.
  • Avg difference (0.000) milliseconds per 125,409 loops.
  • Total difference 4.81 milliseconds for 2,508,180 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, "$k => $dummy", was:

foreach ($GLOBALS['dummy'] as $k => $dummy)
	$k + 1;

The second test, "array_keys()", was:

foreach (array_keys($GLOBALS['dummy']) as $k)
	$k + 1;

Running: Linux (x86_64:1 GB) PHP (