PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: arrays vs. variables

Not that using variables like this is good style, and array1 already mostly answers this.

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Historical Results

Based on (5) saved test runs, The test labeled "$array[$n]" was (on average) the faster by 0.0167 seconds, (2.093% faster)

$array[$n] 100%
${'array_' . $n} 97.907%

The $array[$n] test took 0.7836 seconds.
The ${'array_' . $n} test took 0.8003 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 194,984 loops for a total of 3,899,688 runs.

  • Line execution difference (0.000004) milliseconds.
  • Avg difference (0.000) milliseconds per 194,984 loops.
  • Total difference 16.75 milliseconds for 3,899,688 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, "$array[$n]", was:

$array = array();
for ($i = 0; $i < 100; $i++)
	$array[$i] = $i;

The second test, "${'array_' . $n}", was:

for ($i = 0; $i < 100; $i++)
	${'array_' . $i} = $i;

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