Test: concat (string) vs. not

Is there any gain from casting to a string before concatenation?

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Result: Discarded

The test labeled "no cast" was the faster by 0.0371 seconds, (2.696% faster)

no cast 100%

(string) 97.304%

The no cast test took 1.3376 seconds.
The (string) test took 1.3747 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 288,615 loops for a total of 5,772,300 runs.

Line execution difference (0.000006) milliseconds.
Avg difference (1.853) milliseconds per 288,615 loops.
Total difference 37.06 milliseconds for 5,772,300 loops

The iteration variablity for Code 1 was (7.9570) milliseconds and Code 2 was (9.7385) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

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

for ($j = 0; $j < 1000; $j++)
	$GLOBALS['dummy'] = 'good morning! ' . (string) $j . ' good night!';

The second test, "no cast", was:

for ($j = 0; $j < 1000; $j++)
	$GLOBALS['dummy'] = 'good morning! ' . $j . ' good night!';

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