PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: define constants vs. variables

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Historical Results

Based on (1) saved test runs, The test labeled "constants" was (on average) the faster by 0.0092 seconds, (1.404% faster)

constants 100%
variables 98.596%

The constants test took 0.6491 seconds.
The variables test took 0.6583 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 141,056 loops for a total of 2,821,120 runs.

  • Line execution difference (0.000003) milliseconds.
  • Avg difference (0.000) milliseconds per 141,056 loops.
  • Total difference 9.24 milliseconds for 2,821,120 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, "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 (7.2.15-1+ubuntu16.04.1+deb.sury.org+1)