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 "for" was the faster by 0.0753 seconds, (8.965% faster)

for 100%
array_merge() 91.035%

The for test took 0.7647 seconds.
The array_merge() test took 0.84 seconds.


Each test case ran 20 random code order iterations consisting of 156,943 loops for a total of 3,138,860 runs.

  • Line execution difference (0.000024) milliseconds.
  • Avg difference (3.765) milliseconds per 156,943 loops.
  • Total difference 75.30 milliseconds for 3,138,860 loops

The iteration variablity for Code 1 was (6.7832) milliseconds and Code 2 was (6.3901) 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 (