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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Historical Results

Based on (2) saved test runs, The test labeled "chr()" was (on average) the faster by 0.0046 seconds, (0.464% faster)

chr() 100%
pack() 99.536%

The chr() test took 0.9835 seconds.
The pack() test took 0.9881 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 256,385 loops for a total of 5,127,690 runs.

  • Line execution difference (0.000001) milliseconds.
  • Avg difference (0.000) milliseconds per 256,385 loops.
  • Total difference 4.59 milliseconds for 5,127,690 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.

Code

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 (7.2.15-1+ubuntu16.04.1+deb.sury.org+1)