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 0.0264 seconds, (5.302% faster)

variables 100%
constants 94.698%

The variables test took 0.4721 seconds.
The constants test took 0.4985 seconds.


Each test case ran 20 random code order iterations consisting of 129,144 loops for a total of 2,582,880 runs.

  • Line execution difference (0.000010) milliseconds.
  • Avg difference (1.322) milliseconds per 129,144 loops.
  • Total difference 26.43 milliseconds for 2,582,880 loops

The iteration variablity for Code 1 was (3.7564) milliseconds and Code 2 was (1.6615) 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 (