PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: define constants vs. variables

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Historical Results

Based on (4) saved test runs, The test labeled "constants" was (on average) the faster by 0.0059 seconds, (0.675% faster)

constants 100%
variables 99.325%

The constants test took 0.8667 seconds.
The variables test took 0.8726 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 207,285 loops for a total of 4,145,700 runs.

  • Line execution difference (0.000001) milliseconds.
  • Avg difference (0.000) milliseconds per 207,285 loops.
  • Total difference 5.89 milliseconds for 4,145,700 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.

Code

The first test, "constants", was:

define('CONSTANT' . $GLOBALS['i'], $GLOBALS['x'] . $GLOBALS['y'] . $GLOBALS['z']);
$GLOBALS['i']++;

The second test, "variables", was:

$GLOBALS['CONSTANT' . $GLOBALS['i']] = $GLOBALS['x'] . $GLOBALS['y'] . $GLOBALS['z'];
$GLOBALS['i']++;

Running: Linux (x86_64:1 GB) PHP (7.2.25-1+ubuntu16.04.1+deb.sury.org+1)