PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: preg_replace vs. str_replace

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Historical Results

Based on (14) saved test runs, The test labeled "preg_replace()" was (on average) the faster by 0.0177 seconds, (1.952% faster)

preg_replace() 100%
str_replace() 98.048%

The preg_replace() test took 0.8878 seconds.
The str_replace() test took 0.9055 seconds.


Each test case ran 20 random code order iterations consisting of 215,831 loops for a total of 4,316,624 runs.

  • Line execution difference (0.000004) milliseconds.
  • Avg difference (0.000) milliseconds per 215,831 loops.
  • Total difference 17.68 milliseconds for 4,316,624 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, "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']);

Running: Linux (x86_64:1 GB) PHP (