PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: define constants vs. variables

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Result: Discarded

The test labeled "constants" was the faster by 0.0571 seconds, (3.605% faster)

constants 100%
variables 96.395%

The constants test took 1.5261 seconds.
The variables test took 1.5832 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 281,449 loops for a total of 5,628,980 runs.

  • Line execution difference (0.000010) milliseconds.
  • Avg difference (2.854) milliseconds per 281,449 loops.
  • Total difference 57.08 milliseconds for 5,628,980 loops

The iteration variablity for Code 1 was (10.9679) milliseconds and Code 2 was (13.1488) 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 (7.2.25-1+ubuntu16.04.1+deb.sury.org+1)