PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: include_once vs. function_exists

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Historical Results

Based on (2) saved test runs, The test labeled "function_exists()" was (on average) the faster by 0.0036 seconds, (0.436% faster)

function_exists() 100%
include_once 99.564%

The function_exists() test took 0.8326 seconds.
The include_once test took 0.8362 seconds.


Each test case ran 20 random code order iterations consisting of 206,388 loops for a total of 4,127,750 runs.

  • Line execution difference (0.000001) milliseconds.
  • Avg difference (0.000) milliseconds per 206,388 loops.
  • Total difference 3.65 milliseconds for 4,127,750 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, "include_once", was:



The second test, "function_exists()", was:


if (!function_exists('f2'))

Running: Linux (x86_64:1 GB) PHP (