PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: defined vs. isset

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Result: Discarded

The test labeled "defined()" was the faster by 0.0063 seconds, (1.102% faster)

defined() 100%
isset() 98.898%

The defined() test took 0.5668 seconds.
The isset() test took 0.5731 seconds.


Each test case ran 20 random code order iterations consisting of 141,186 loops for a total of 2,823,720 runs.

  • Line execution difference (0.000002) milliseconds.
  • Avg difference (0.316) milliseconds per 141,186 loops.
  • Total difference 6.32 milliseconds for 2,823,720 loops

The iteration variablity for Code 1 was (3.6589) milliseconds and Code 2 was (4.4129) milliseconds. The lower and the closer together there values are the more accurate the results are.


The first test, "defined()", was:

$GLOBALS['test'] = defined('CONSTANT');

The second test, "isset()", was:

$GLOBALS['test'] = isset($GLOBALS['CONSTANT']);

Running: Linux (x86_64:1 GB) PHP (