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 (4) saved test runs, The test labeled "array_keys(array_flip())" was (on average) the faster by 0.0108 seconds, (1.258% faster)

array_keys(array_flip()) 100%
array_unique() 98.742%

The array_keys(array_flip()) test took 0.8495 seconds.
The array_unique() test took 0.8604 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 213,879 loops for a total of 4,277,570 runs.

  • Line execution difference (0.000003) milliseconds.
  • Avg difference (0.000) milliseconds per 213,879 loops.
  • Total difference 10.82 milliseconds for 4,277,570 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_keys(array_flip())", was:

$array = array();
for ($n = 0; $n < 8; $n++)
{
	for ($i = 0; $i < 50; $i++)
		$array[] = $i;
}

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

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

$array = array();
for ($n = 0; $n < 8; $n++)
{
	for ($i = 0; $i < 50; $i++)
		$array[] = $i;
}

$array = array_unique($array);

Running: Linux (x86_64:1 GB) PHP (7.2.15-1+ubuntu16.04.1+deb.sury.org+1)