PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: redefine constant

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Historical Results

Based on (5) saved test runs, The test labeled "!defined()" was (on average) the faster by 0.0189 seconds, (1.943% faster)

!defined() 100%
@define() 98.057%

The !defined() test took 0.9546 seconds.
The @define() test took 0.9735 seconds.


Each test case ran 20 random code order iterations consisting of 221,878 loops for a total of 4,437,560 runs.

  • Line execution difference (0.000004) milliseconds.
  • Avg difference (0.000) milliseconds per 221,878 loops.
  • Total difference 18.91 milliseconds for 4,437,560 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, "@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 (