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

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Result: Discarded

The test labeled "{5}" was the faster by 0.005 seconds, (0.852% faster)

{5} 100%

substr() 99.148%

The {5} test took 0.5791 seconds.
The substr() test took 0.584 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 125,917 loops for a total of 2,518,340 runs.

Line execution difference (0.000002) milliseconds.
Avg difference (0.249) milliseconds per 125,917 loops.
Total difference 4.97 milliseconds for 2,518,340 loops

The iteration variablity for Code 1 was (3.4783) milliseconds and Code 2 was (3.9033) 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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