PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: preg_replace vs. preg_replace_callback

Although preg_replace with 'e' is depreciated, this is left for historical reasons

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Result: Discarded

The test labeled "preg_replace_callback()" was the faster by 0.0767 seconds, (8.556% faster)

preg_replace_callback() 100%
preg_replace() 91.444%

The preg_replace_callback() test took 0.8199 seconds.
The preg_replace() test took 0.8966 seconds.


Each test case ran 20 random code order iterations consisting of 131,359 loops for a total of 2,627,180 runs.

  • Line execution difference (0.000029) milliseconds.
  • Avg difference (3.836) milliseconds per 131,359 loops.
  • Total difference 76.71 milliseconds for 2,627,180 loops

The iteration variablity for Code 1 was (8.6558) milliseconds and Code 2 was (8.9506) 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)~e', "strtolower('$1')", $GLOBALS['dummy']);

The second test, "preg_replace_callback()", was:

function cb($match)
	return strtolower($match[0]);

$GLOBALS['dummy2'] = preg_replace_callback('~([Ww]heat|[Tt]hins)~', 'cb', $GLOBALS['dummy']);

Running: Linux (x86_64:1 GB) PHP (