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 0.0092 seconds, (1.722% faster)

constants 100%
variables 98.278%

The constants test took 0.5252 seconds.
The variables test took 0.5344 seconds.


Each test case ran 20 random code order iterations consisting of 137,068 loops for a total of 2,741,360 runs.

  • Line execution difference (0.000003) milliseconds.
  • Avg difference (0.460) milliseconds per 137,068 loops.
  • Total difference 9.20 milliseconds for 2,741,360 loops

The iteration variablity for Code 1 was (1.8547) milliseconds and Code 2 was (1.2485) 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 (