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

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Result: Discarded

The test labeled "substr()" was the faster by 0.0199 seconds, (3.414% faster)

substr() 100%

{5} 96.586%

The substr() test took 0.5616 seconds.
The {5} test took 0.5815 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 141,735 loops for a total of 2,834,700 runs.

Line execution difference (0.000007) milliseconds.
Avg difference (0.993) milliseconds per 141,735 loops.
Total difference 19.85 milliseconds for 2,834,700 loops

The iteration variablity for Code 1 was (1.8441) milliseconds and Code 2 was (2.1215) 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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