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 0.0556 seconds, (5.018% faster)

defined() 100%
isset() 94.982%

The defined() test took 1.0527 seconds.
The isset() test took 1.1083 seconds.


Each test case ran 20 random code order iterations consisting of 286,545 loops for a total of 5,730,900 runs.

  • Line execution difference (0.000010) milliseconds.
  • Avg difference (2.781) milliseconds per 286,545 loops.
  • Total difference 55.61 milliseconds for 5,730,900 loops

The iteration variablity for Code 1 was (2.5640) milliseconds and Code 2 was (4.1568) 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 (