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 0.0381 seconds, (5.806% faster)

defined() 100%
isset() 94.194%

The defined() test took 0.6182 seconds.
The isset() test took 0.6563 seconds.


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.


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 (