PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: redefine constant

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Historical Results

Based on (1) saved test runs, The test labeled "!defined()" was (on average) the faster by 0.029 seconds, (2.614% faster)

!defined() 100%
@define() 97.386%

The !defined() test took 1.0785 seconds.
The @define() test took 1.1075 seconds.


Each test case ran 20 random code order iterations consisting of 262,801 loops for a total of 5,256,020 runs.

  • Line execution difference (0.000006) milliseconds.
  • Avg difference (0.000) milliseconds per 262,801 loops.
  • Total difference 28.95 milliseconds for 5,256,020 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 (