PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: str_ireplace vs. strtolower + str_replace

Replace a string, regardless of its case, with an uppercase variant. 10 replacements in a 750 character line. str_replace/strtolower does not preserve existing case of the rest of the string.

View test history (4) Run this test again Return to test menu

Result: Discarded

The test labeled "str_replace/strtolower" was the faster by 0.1162 seconds, (8.252% faster)

str_replace/strtolower 100%
str_ireplace 91.748%

The str_replace/strtolower test took 1.2915 seconds.
The str_ireplace test took 1.4077 seconds.


Each test case ran 20 random code order iterations consisting of 277,584 loops for a total of 5,551,680 runs.

  • Line execution difference (0.000021) milliseconds.
  • Avg difference (5.808) milliseconds per 277,584 loops.
  • Total difference 116.16 milliseconds for 5,551,680 loops

The iteration variablity for Code 1 was (11.0085) milliseconds and Code 2 was (6.7756) milliseconds. The lower and the closer together there values are the more accurate the results are.


The first test, "str_ireplace", was:

str_ireplace('sTrIng', 'STRING!', $GLOBALS['dummy']);

The second test, "str_replace/strtolower", was:

str_replace('string', 'STRING!', strtolower($GLOBALS['dummy']));

Running: Linux (x86_64:1 GB) PHP (