Test: defined vs. isset
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The test labeled "defined()" was the faster by 0.0406 seconds, (6.657% faster)
The defined() test took 0.5699 seconds.
The isset() test took 0.6106 seconds.
Nitty-Gritty
Each test case ran 20 random code order iterations consisting of 139,763 loops for a total of 2,795,260 runs.
- Line execution difference (0.000015) milliseconds.
- Avg difference (2.032) milliseconds per 139,763 loops.
- Total difference 40.64 milliseconds for 2,795,260 loops
The iteration variablity for Code 1 was (1.6868) milliseconds and Code 2 was (2.2664) 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']);