PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: define constants vs. variables

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Result: Discarded

The test labeled "variables" was the faster by 0.0187 seconds, (3.862% faster)

variables 100%
constants 96.138%

The variables test took 0.4643 seconds.
The constants test took 0.483 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 117,126 loops for a total of 2,342,520 runs.

  • Line execution difference (0.000008) milliseconds.
  • Avg difference (0.933) milliseconds per 117,126 loops.
  • Total difference 18.65 milliseconds for 2,342,520 loops

The iteration variablity for Code 1 was (1.5655) milliseconds and Code 2 was (1.1136) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

The first test, "constants", was:

define('CONSTANT' . $GLOBALS['i'], $GLOBALS['x'] . $GLOBALS['y'] . $GLOBALS['z']);
$GLOBALS['i']++;

The second test, "variables", was:

$GLOBALS['CONSTANT' . $GLOBALS['i']] = $GLOBALS['x'] . $GLOBALS['y'] . $GLOBALS['z'];
$GLOBALS['i']++;

Running: Linux (x86_64:1 GB) PHP (7.2.22-1+ubuntu16.04.1+deb.sury.org+1)