Historical Results
Based on (1) saved test runs, The test labeled "file_exists()" was (on average) the faster by 0.019 seconds, (1.964% faster)
The file_exists() test took 0.947 seconds.
The require test took 0.966 seconds.
Nitty-Gritty
Each test case ran 20 random code order iterations consisting of 139,218 loops for a total of 2,784,360 runs.
- Line execution difference (0.000007) milliseconds.
- Avg difference (0.000) milliseconds per 139,218 loops.
- Total difference 18.97 milliseconds for 2,784,360 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, "file_exists()", was:
clearstatcache();
if (!file_exists('supplement/dummy.inc'))
trigger_error('Required file not found!', E_USER_ERROR);
include('supplement/dummy.inc');
The second test, "require", was:
clearstatcache();
require('supplement/dummy.inc');