PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: defined vs. isset

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Historical Results

Based on (2) saved test runs, The test labeled "defined()" was (on average) the faster by 0.0029 seconds, (0.385% faster)

defined() 100%
isset() 99.615%

The defined() test took 0.7487 seconds.
The isset() test took 0.7516 seconds.


Each test case ran 20 random code order iterations consisting of 210,299 loops for a total of 4,205,980 runs.

  • Line execution difference (0.000001) milliseconds.
  • Avg difference (0.000) milliseconds per 210,299 loops.
  • Total difference 2.89 milliseconds for 4,205,980 loops

The iteration variablity for Code 1 was (0.0000) milliseconds and Code 2 was (0.0000) 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 (