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?

View test history (10) Run this test again Return to test menu

Result: Discarded

The test labeled "array_merge()" was the faster by 0.0277 seconds, (4.837% faster)

array_merge() 100%
for 95.163%

The array_merge() test took 0.5444 seconds.
The for test took 0.5721 seconds.


Each test case ran 20 random code order iterations consisting of 142,203 loops for a total of 2,844,060 runs.

  • Line execution difference (0.000010) milliseconds.
  • Avg difference (1.384) milliseconds per 142,203 loops.
  • Total difference 27.67 milliseconds for 2,844,060 loops

The iteration variablity for Code 1 was (0.7018) milliseconds and Code 2 was (1.1993) 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 (