PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: array_keys(array_flip) vs. array_unique

Do note that this test is only using integer values (which is common for this), long strings will take longer to hash as array keys.

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Historical Results

Based on (13) saved test runs, The test labeled "array_keys(array_flip())" was (on average) the faster by 0.0078 seconds, (0.850% faster)

array_keys(array_flip()) 100%
array_unique() 99.15%

The array_keys(array_flip()) test took 0.9045 seconds.
The array_unique() test took 0.9122 seconds.


Each test case ran 20 random code order iterations consisting of 236,074 loops for a total of 4,721,489 runs.

  • Line execution difference (0.000002) milliseconds.
  • Avg difference (0.000) milliseconds per 236,074 loops.
  • Total difference 7.76 milliseconds for 4,721,489 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.


The first test, "array_keys(array_flip())", was:

$array = array(1,2,3,4,5,6,7,8,9);
$a = 1;

if (in_array(1,$array) || $a)
	$b = true;

$array = array_keys(array_flip($array));

The second test, "array_unique()", was:

$array = array(1,2,3,4,5,6,7,8,9);
$a = 1;

if ($a || in_array(1,$array))
	$b = true;

Running: Linux (x86_64:1 GB) PHP (