Test: defined vs. isset
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The test labeled "defined()" was the faster by 0.0146 seconds, (1.285% faster)
The defined() test took 1.1219 seconds.
The isset() test took 1.1365 seconds.
Nitty-Gritty
Each test case ran 20 random code order iterations consisting of 283,255 loops for a total of 5,665,100 runs.
- Line execution difference (0.000003) milliseconds.
- Avg difference (0.730) milliseconds per 283,255 loops.
- Total difference 14.60 milliseconds for 5,665,100 loops
The iteration variablity for Code 1 was (4.2507) milliseconds and Code 2 was (3.5345) milliseconds. The lower and the closer together there values are the more accurate the results are.
Code
The first test, "defined()", was:
$GLOBALS['test'] = defined('CONSTANT');
The second test, "isset()", was:
$GLOBALS['test'] = isset($GLOBALS['CONSTANT']);