Test: array_merge vs. + (string keys)

Semantically, array_merge() and + are identical when the arrays contain string keys.

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Result: Discarded

The test labeled "array_merge()" was the faster by 0.0268 seconds, (2.604% faster)

array_merge() 100%

add operator 97.396%

The array_merge() test took 1.0025 seconds.
The add operator test took 1.0294 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 278,783 loops for a total of 5,575,660 runs.

Line execution difference (0.000005) milliseconds.
Avg difference (1.340) milliseconds per 278,783 loops.
Total difference 26.81 milliseconds for 5,575,660 loops

The iteration variablity for Code 1 was (2.7406) milliseconds and Code 2 was (3.1519) 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, "add operator", was:

$array = $GLOBALS['dummy1'] + $GLOBALS['dummy2'] + $GLOBALS['dummy3'];

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