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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Historical Results

Based on (4) saved test runs, The test labeled "str_ireplace" was (on average) the faster by 0.0128 seconds, (1.342% faster)

str_ireplace 100%
str_replace/strtolower 98.658%

The str_ireplace test took 0.9373 seconds.
The str_replace/strtolower test took 0.9501 seconds.


Each test case ran 20 random code order iterations consisting of 252,448 loops for a total of 5,048,965 runs.

  • Line execution difference (0.000003) milliseconds.
  • Avg difference (0.000) milliseconds per 252,448 loops.
  • Total difference 12.75 milliseconds for 5,048,965 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.


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 (