Historical Results
Based on (5) saved test runs, The test labeled "!defined()" was (on average) the faster by 0.0189 seconds, (1.943% faster)
The !defined() test took 0.9546 seconds.
The @define() test took 0.9735 seconds.
Nitty-Gritty
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.
Code
The first test, "@define()", was:
@define('CONSTANT', $GLOBALS['dummy']);
The second test, "!defined()", was:
if (!defined('CONSTANT'))
define('CONSTANT', $GLOBALS['dummy']);