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 0.0991 seconds, (9.618% faster)

@define() 100%
!defined() 90.382%

The @define() test took 0.9315 seconds.
The !defined() test took 1.0307 seconds.


Each test case ran 20 random code order iterations consisting of 259,267 loops for a total of 5,185,340 runs.

  • Line execution difference (0.000019) milliseconds.
  • Avg difference (4.956) milliseconds per 259,267 loops.
  • Total difference 99.13 milliseconds for 5,185,340 loops

The iteration variablity for Code 1 was (0.6708) milliseconds and Code 2 was (7.6923) 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 (