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 0.0093 seconds, (1.850% faster)

variables 100%
constants 98.15%

The variables test took 0.495 seconds.
The constants test took 0.5043 seconds.


Each test case ran 20 random code order iterations consisting of 119,880 loops for a total of 2,397,600 runs.

  • Line execution difference (0.000004) milliseconds.
  • Avg difference (0.466) milliseconds per 119,880 loops.
  • Total difference 9.33 milliseconds for 2,397,600 loops

The iteration variablity for Code 1 was (2.8782) milliseconds and Code 2 was (2.3172) 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 (