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 0.0097 seconds, (0.916% faster)

isset {5} 100%

substr() 99.084%

The isset {5} test took 1.0513 seconds.
The substr() test took 1.061 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 207,484 loops for a total of 4,149,680 runs.

Line execution difference (0.000002) milliseconds.
Avg difference (0.486) milliseconds per 207,484 loops.
Total difference 9.72 milliseconds for 4,149,680 loops

The iteration variablity for Code 1 was (9.6363) milliseconds and Code 2 was (8.4652) 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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