PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: chr v. pack

Note that this test uses concatenation for many chr()'s vs. one pack(). In a case with many calls to pack(), the result might be different (but this is a less common use.)

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Result: Discarded

The test labeled "pack()" was the faster by 0.0027 seconds, (0.564% faster)

pack() 100%
chr() 99.436%

The pack() test took 0.472 seconds.
The chr() test took 0.4747 seconds.


Each test case ran 20 random code order iterations consisting of 134,778 loops for a total of 2,695,560 runs.

  • Line execution difference (0.000001) milliseconds.
  • Avg difference (0.134) milliseconds per 134,778 loops.
  • Total difference 2.68 milliseconds for 2,695,560 loops

The iteration variablity for Code 1 was (0.7436) milliseconds and Code 2 was (0.2946) milliseconds. The lower and the closer together there values are the more accurate the results are.


The first test, "chr()", was:

$GLOBALS['dummy'] = chr(65) . chr(65) . chr(65) . chr(65);

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

$GLOBALS['dummy'] = pack('C4', 65, 65, 65, 65);

Running: Linux (x86_64:1 GB) PHP (