PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: ord v. unpack (str keys)

Does unpack (with its strange format string) go any faster than creating your own associative array?

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Result: Discarded

The test labeled "unpack()" was the faster by 0.0582 seconds, (5.382% faster)

unpack() 100%
ord() 94.618%

The unpack() test took 1.023 seconds.
The ord() test took 1.0812 seconds.


Each test case ran 20 random code order iterations consisting of 279,015 loops for a total of 5,580,300 runs.

  • Line execution difference (0.000010) milliseconds.
  • Avg difference (2.909) milliseconds per 279,015 loops.
  • Total difference 58.19 milliseconds for 5,580,300 loops

The iteration variablity for Code 1 was (7.4569) milliseconds and Code 2 was (2.8518) milliseconds. The lower and the closer together there values are the more accurate the results are.


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

$GLOBALS['dummy'] = array(
	'a' => ord($GLOBALS['packed']{0}),
	'b' => ord($GLOBALS['packed']{1}),
	'c' => ord($GLOBALS['packed']{2}),
	'd' => ord($GLOBALS['packed']{3}),

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

$GLOBALS['dummy'] = unpack('Ca/Cb/Cc/Cd', $GLOBALS['packed']);

Running: Linux (x86_64:1 GB) PHP (