PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: defined vs. isset

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Historical Results

Based on (1) saved test runs, The test labeled "defined()" was (on average) the faster by 0.0207 seconds, (3.373% faster)

defined() 100%
isset() 96.627%

The defined() test took 0.5916 seconds.
The isset() test took 0.6123 seconds.


Each test case ran 20 random code order iterations consisting of 161,552 loops for a total of 3,231,040 runs.

  • Line execution difference (0.000006) milliseconds.
  • Avg difference (0.000) milliseconds per 161,552 loops.
  • Total difference 20.65 milliseconds for 3,231,040 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 (