PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: redefine constant

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Result: Discarded

The test labeled "@define()" was the faster by 0.018 seconds, (2.678% faster)

@define() 100%
!defined() 97.322%

The @define() test took 0.6558 seconds.
The !defined() test took 0.6738 seconds.


Each test case ran 20 random code order iterations consisting of 134,583 loops for a total of 2,691,660 runs.

  • Line execution difference (0.000007) milliseconds.
  • Avg difference (0.902) milliseconds per 134,583 loops.
  • Total difference 18.05 milliseconds for 2,691,660 loops

The iteration variablity for Code 1 was (2.1170) milliseconds and Code 2 was (2.9966) milliseconds. The lower and the closer together there values are the more accurate the results are.


The first test, "@define()", was:

@define('CONSTANT', $GLOBALS['dummy']);

The second test, "!defined()", was:

if (!defined('CONSTANT'))
	define('CONSTANT', $GLOBALS['dummy']);

Running: Linux (x86_64:1 GB) PHP (