PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: include_once vs. function_exists

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Result: Discarded

The test labeled "function_exists()" was the faster by 0.0552 seconds, (7.065% faster)

function_exists() 100%
include_once 92.935%

The function_exists() test took 0.7261 seconds.
The include_once test took 0.7813 seconds.


Each test case ran 20 random code order iterations consisting of 149,157 loops for a total of 2,983,140 runs.

  • Line execution difference (0.000019) milliseconds.
  • Avg difference (2.760) milliseconds per 149,157 loops.
  • Total difference 55.20 milliseconds for 2,983,140 loops

The iteration variablity for Code 1 was (7.6631) milliseconds and Code 2 was (4.4671) 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 (