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 0.0523 seconds, (4.403% faster)

variables 100%
constants 95.597%

The variables test took 1.135 seconds.
The constants test took 1.1873 seconds.


Each test case ran 20 random code order iterations consisting of 248,735 loops for a total of 4,974,700 runs.

  • Line execution difference (0.000011) milliseconds.
  • Avg difference (2.614) milliseconds per 248,735 loops.
  • Total difference 52.27 milliseconds for 4,974,700 loops

The iteration variablity for Code 1 was (12.1215) milliseconds and Code 2 was (10.5639) 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 (