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.

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Result: Discarded

The test labeled "str_replace/strtolower" was the faster by 0.0776 seconds, (6.143% faster)

str_replace/strtolower 100%
str_ireplace 93.857%

The str_replace/strtolower test took 1.186 seconds.
The str_ireplace test took 1.2637 seconds.


Each test case ran 20 random code order iterations consisting of 295,685 loops for a total of 5,913,700 runs.

  • Line execution difference (0.000013) milliseconds.
  • Avg difference (3.881) milliseconds per 295,685 loops.
  • Total difference 77.63 milliseconds for 5,913,700 loops

The iteration variablity for Code 1 was (13.1366) milliseconds and Code 2 was (8.6963) 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 (