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

Return the nth character of a string, substring vs string array checking.

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Result: Discarded

The test labeled "isset {5}" was the faster by 0.0593 seconds, (4.864% faster)

isset {5} 100%

substr() 95.136%

The isset {5} test took 1.1597 seconds.
The substr() test took 1.219 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 169,501 loops for a total of 3,390,020 runs.

Line execution difference (0.000017) milliseconds.
Avg difference (2.964) milliseconds per 169,501 loops.
Total difference 59.29 milliseconds for 3,390,020 loops

The iteration variablity for Code 1 was (6.0751) milliseconds and Code 2 was (7.1496) 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, "isset {5}", was:

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

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