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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Historical Results

Based on (1) saved test runs, The test labeled "for" was (on average) the faster by 0.0542 seconds, (5.164% faster)

for 100%
array_merge() 94.836%

The for test took 0.995 seconds.
The array_merge() test took 1.0492 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 249,178 loops for a total of 4,983,560 runs.

  • Line execution difference (0.000011) milliseconds.
  • Avg difference (0.000) milliseconds per 249,178 loops.
  • Total difference 54.18 milliseconds for 4,983,560 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.

Code

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 (7.2.25-1+ubuntu16.04.1+deb.sury.org+1)