PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: using constants vs. variables

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Historical Results

Based on (1) saved test runs, The test labeled "constants" was (on average) the faster by 0.0145 seconds, (3.208% faster)

constants 100%
variables 96.792%

The constants test took 0.4366 seconds.
The variables test took 0.451 seconds.


Each test case ran 20 random code order iterations consisting of 104,271 loops for a total of 2,085,420 runs.

  • Line execution difference (0.000007) milliseconds.
  • Avg difference (0.000) milliseconds per 104,271 loops.
  • Total difference 14.47 milliseconds for 2,085,420 loops

The iteration variablity for Code 1 was (0.0000) milliseconds and Code 2 was (0.0000) 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 (