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.)

View test history (5) Run this test again Return to test menu

Result: Discarded

The test labeled "pack()" was the faster by 0.0157 seconds, (1.838% faster)

pack() 100%
chr() 98.162%

The pack() test took 0.8361 seconds.
The chr() test took 0.8517 seconds.


Each test case ran 20 random code order iterations consisting of 207,896 loops for a total of 4,157,920 runs.

  • Line execution difference (0.000004) milliseconds.
  • Avg difference (0.783) milliseconds per 207,896 loops.
  • Total difference 15.65 milliseconds for 4,157,920 loops

The iteration variablity for Code 1 was (6.6651) milliseconds and Code 2 was (5.9234) 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 (