Test: passing classes vs. arrays

Is there any penalty (either way) in passing class objects vs. arrays? Theoretically, they are semantically equivalent.

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Result: Discarded

The test labeled "classes" was the faster by 0.0751 seconds, (8.438% faster)

classes 100%

arrays 91.562%

The classes test took 0.8146 seconds.
The arrays test took 0.8896 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 156,899 loops for a total of 3,137,980 runs.

Line execution difference (0.000024) milliseconds.
Avg difference (3.753) milliseconds per 156,899 loops.
Total difference 75.07 milliseconds for 3,137,980 loops

The iteration variablity for Code 1 was (5.4841) milliseconds and Code 2 was (7.0117) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

The first test, "classes", was:

/*
class Example
{
	var $x;
}

function example_class($x)
{
	$GLOBALS['dummy'] = $x->x;
}

$GLOBALS['test_object'] = new Example();
$GLOBALS['test_object']->x = 42;
*/

example_class($GLOBALS['test_object']);

The second test, "arrays", was:

/*
function example_array($x)
{
	$GLOBALS['dummy'] = $x['x'];
}

$GLOBALS['test_array'] = array();
$GLOBALS['test_array']['x'] = 42;
*/

example_array($GLOBALS['test_array']);

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