Historical Results
Based on (4) saved test runs, The test labeled "str_replace()" was (on average) the faster by 0.0033 seconds, (0.340% faster)
The str_replace() test took 0.9814 seconds.
The preg_replace() test took 0.9848 seconds.
Nitty-Gritty
Each test case ran 20 random code order iterations consisting of 246,961 loops for a total of 4,939,215 runs.
- Line execution difference (0.000001) milliseconds.
- Avg difference (0.000) milliseconds per 246,961 loops.
- Total difference 3.35 milliseconds for 4,939,215 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, "preg_replace()", was:
$GLOBALS['dummy2'] = preg_replace('~([Ww]heat|[Tt]hins)~', 'Nilla', $GLOBALS['dummy']);
The second test, "str_replace()", was:
$GLOBALS['dummy2'] = str_replace(array('Wheat', 'Thins', 'wheat', 'thins'), 'Nilla', $GLOBALS['dummy']);