PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: array_merge vs. for (int keys)

The benefit of array_merge() is it doesn't overwrite int keys. But what if we do it manually?

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Result: Discarded

The test labeled "array_merge()" was the faster by 0.0806 seconds, (6.768% faster)

array_merge() 100%
for 93.232%

The array_merge() test took 1.1108 seconds.
The for test took 1.1914 seconds.


Each test case ran 20 random code order iterations consisting of 286,007 loops for a total of 5,720,140 runs.

  • Line execution difference (0.000014) milliseconds.
  • Avg difference (4.031) milliseconds per 286,007 loops.
  • Total difference 80.63 milliseconds for 5,720,140 loops

The iteration variablity for Code 1 was (5.5169) milliseconds and Code 2 was (7.3300) milliseconds. The lower and the closer together there values are the more accurate the results are.


The first test, "array_merge()", was:

$array = array_merge($GLOBALS['dummy1'], $GLOBALS['dummy2'], $GLOBALS['dummy3']);

The second test, "for", was:

$array = $GLOBALS['dummy1'];
for ($i = 0, $n = count($GLOBALS['dummy2']); $i < $n; $i++)
	$array[] = $GLOBALS['dummy2'][$i];
for ($i = 0, $n = count($GLOBALS['dummy3']); $i < $n; $i++)
	$array[] = $GLOBALS['dummy3'][$i];

Running: Linux (x86_64:1 GB) PHP (