Test: substr($var, 5, 1) vs. {5}

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Result: Discarded

The test labeled "substr()" was the faster by 0.0132 seconds, (1.187% faster)

substr() 100%

{5} 98.813%

The substr() test took 1.099 seconds.
The {5} test took 1.1122 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 285,084 loops for a total of 5,701,680 runs.

Line execution difference (0.000002) milliseconds.
Avg difference (0.660) milliseconds per 285,084 loops.
Total difference 13.20 milliseconds for 5,701,680 loops

The iteration variablity for Code 1 was (6.8998) milliseconds and Code 2 was (4.2735) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

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

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = substr($GLOBALS['dummy'], 5, 1);

The second test, "{5}", was:

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = $GLOBALS['dummy']{5};

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