PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: include_once vs. function_exists

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Historical Results

Based on (1) saved test runs, The test labeled "include_once" was (on average) the faster by 0.0141 seconds, (2.127% faster)

include_once 100%
function_exists() 97.873%

The include_once test took 0.6482 seconds.
The function_exists() test took 0.6622 seconds.


Each test case ran 20 random code order iterations consisting of 139,449 loops for a total of 2,788,980 runs.

  • Line execution difference (0.000005) milliseconds.
  • Avg difference (0.000) milliseconds per 139,449 loops.
  • Total difference 14.09 milliseconds for 2,788,980 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, "include_once", was:



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


if (!function_exists('f2'))

Running: Linux (x86_64:1 GB) PHP (