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 (1) saved test runs, The test labeled "chr()" was (on average) the faster by 0.0136 seconds, (1.251% faster)

chr() 100%
pack() 98.749%

The chr() test took 1.0712 seconds.
The pack() test took 1.0848 seconds.


Each test case ran 20 random code order iterations consisting of 276,259 loops for a total of 5,525,180 runs.

  • Line execution difference (0.000002) milliseconds.
  • Avg difference (0.000) milliseconds per 276,259 loops.
  • Total difference 13.57 milliseconds for 5,525,180 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.


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 (