PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: define 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 0.0016 seconds, (0.215% faster)

constants 100%
variables 99.785%

The constants test took 0.7625 seconds.
The variables test took 0.7642 seconds.


Each test case ran 20 random code order iterations consisting of 117,364 loops for a total of 2,347,280 runs.

  • Line execution difference (0.000001) milliseconds.
  • Avg difference (0.000) milliseconds per 117,364 loops.
  • Total difference 1.64 milliseconds for 2,347,280 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:

define('CONSTANT' . $GLOBALS['i'], $GLOBALS['x'] . $GLOBALS['y'] . $GLOBALS['z']);

The second test, "variables", was:


Running: Linux (x86_64:1 GB) PHP (