Historical Results
Based on (1) saved test runs, The test labeled "@define()" was (on average) the faster by 0.0181 seconds, (1.728% faster)
The @define() test took 1.029 seconds.
The !defined() test took 1.0471 seconds.
Nitty-Gritty
Each test case ran 20 random code order iterations consisting of 291,271 loops for a total of 5,825,420 runs.
- Line execution difference (0.000003) milliseconds.
- Avg difference (0.000) milliseconds per 291,271 loops.
- Total difference 18.09 milliseconds for 5,825,420 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']);