PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: defined vs. isset

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Result: Discarded

The test labeled "isset()" was the faster by 0.0017 seconds, (0.164% faster)

isset() 100%
defined() 99.836%

The isset() test took 1.0176 seconds.
The defined() test took 1.0193 seconds.


Each test case ran 20 random code order iterations consisting of 237,974 loops for a total of 4,759,480 runs.

  • Line execution difference (0.000000) milliseconds.
  • Avg difference (0.084) milliseconds per 237,974 loops.
  • Total difference 1.68 milliseconds for 4,759,480 loops

The iteration variablity for Code 1 was (3.2153) milliseconds and Code 2 was (3.9942) 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 (