PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: using constants vs. variables

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Result: Discarded

The test labeled "variables" was the faster by 0.0259 seconds, (2.385% faster)

variables 100%
constants 97.615%

The variables test took 1.0616 seconds.
The constants test took 1.0875 seconds.


Each test case ran 20 random code order iterations consisting of 291,930 loops for a total of 5,838,600 runs.

  • Line execution difference (0.000004) milliseconds.
  • Avg difference (1.297) milliseconds per 291,930 loops.
  • Total difference 25.94 milliseconds for 5,838,600 loops

The iteration variablity for Code 1 was (5.6946) milliseconds and Code 2 was (2.6930) milliseconds. The lower and the closer together there values are the more accurate the results are.


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 (