Test: defined vs. isset
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The test labeled "defined()" was the faster by 0.0381 seconds, (5.806% faster)
The defined() test took 0.6182 seconds.
The isset() test took 0.6563 seconds.
Nitty-Gritty
Each test case ran 20 random code order iterations consisting of 149,489 loops for a total of 2,989,780 runs.
- Line execution difference (0.000013) milliseconds.
- Avg difference (1.905) milliseconds per 149,489 loops.
- Total difference 38.11 milliseconds for 2,989,780 loops
The iteration variablity for Code 1 was (4.0685) milliseconds and Code 2 was (6.1671) 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']);