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 0.0124 seconds, (1.281% faster)

isset {5} 100%

substr() 98.719%

The isset {5} test took 0.9555 seconds.
The substr() test took 0.9679 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 259,789 loops for a total of 5,195,780 runs.

Line execution difference (0.000002) milliseconds.
Avg difference (0.620) milliseconds per 259,789 loops.
Total difference 12.40 milliseconds for 5,195,780 loops

The iteration variablity for Code 1 was (3.6973) milliseconds and Code 2 was (1.8626) 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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