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()" was the faster by 0.0239 seconds, (2.264% faster)

preg_replace() 100%
preg_replace_callback() 97.736%

The preg_replace() test took 1.0304 seconds.
The preg_replace_callback() test took 1.0542 seconds.


Each test case ran 20 random code order iterations consisting of 293,000 loops for a total of 5,860,000 runs.

  • Line execution difference (0.000004) milliseconds.
  • Avg difference (1.194) milliseconds per 293,000 loops.
  • Total difference 23.87 milliseconds for 5,860,000 loops

The iteration variablity for Code 1 was (1.0584) milliseconds and Code 2 was (1.9132) 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 (