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 0.0176 seconds, (1.535% faster)

defined() 100%
isset() 98.465%

The defined() test took 1.1292 seconds.
The isset() test took 1.1468 seconds.


Each test case ran 20 random code order iterations consisting of 282,207 loops for a total of 5,644,140 runs.

  • Line execution difference (0.000003) milliseconds.
  • Avg difference (0.880) milliseconds per 282,207 loops.
  • Total difference 17.60 milliseconds for 5,644,140 loops

The iteration variablity for Code 1 was (5.9738) milliseconds and Code 2 was (4.9215) 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 (