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 0.0223 seconds, (2.105% faster)

array_merge() 100%
for 97.895%

The array_merge() test took 1.0376 seconds.
The for test took 1.0599 seconds.


Each test case ran 20 random code order iterations consisting of 288,417 loops for a total of 5,768,340 runs.

  • Line execution difference (0.000004) milliseconds.
  • Avg difference (1.116) milliseconds per 288,417 loops.
  • Total difference 22.31 milliseconds for 5,768,340 loops

The iteration variablity for Code 1 was (2.5554) milliseconds and Code 2 was (3.4631) 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 (