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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The test labeled "chr()" was the faster by 0.007 seconds, (1.086% faster)
The chr() test took 0.6347 seconds.
The pack() test took 0.6417 seconds.
Nitty-Gritty
Each test case ran 20 random code order iterations consisting of 151,885 loops for a total of 3,037,700 runs.
- Line execution difference (0.000002) milliseconds.
- Avg difference (0.349) milliseconds per 151,885 loops.
- Total difference 6.97 milliseconds for 3,037,700 loops
The iteration variablity for Code 1 was (1.2401) milliseconds and Code 2 was (1.1633) 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);