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 "@define()" was (on average) the faster by 0.0351 seconds, (3.329% faster)

@define() 100%
!defined() 96.671%

The @define() test took 1.02 seconds.
The !defined() test took 1.0552 seconds.


Each test case ran 20 random code order iterations consisting of 287,133 loops for a total of 5,742,660 runs.

  • Line execution difference (0.000006) milliseconds.
  • Avg difference (0.000) milliseconds per 287,133 loops.
  • Total difference 35.13 milliseconds for 5,742,660 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 (