PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: using constants vs. variables

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Result: Discarded

The test labeled "constants" was the faster by 0.0391 seconds, (6.693% faster)

constants 100%
variables 93.307%

The constants test took 0.5454 seconds.
The variables test took 0.5846 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 133,992 loops for a total of 2,679,840 runs.

  • Line execution difference (0.000015) milliseconds.
  • Avg difference (1.956) milliseconds per 133,992 loops.
  • Total difference 39.12 milliseconds for 2,679,840 loops

The iteration variablity for Code 1 was (3.6723) milliseconds and Code 2 was (5.1540) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

The first test, "constants", was:

$GLOBALS['test'] = CONSTANT + 1;

The second test, "variables", was:

$GLOBALS['test'] = $GLOBALS['CONSTANT'] + 1;

Running: Linux (x86_64:1 GB) PHP (7.2.25-1+ubuntu16.04.1+deb.sury.org+1)