Test: substr negative vs. strlen

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Result: Saved

The test labeled "substr($var, -1)" was the faster by 0.009 seconds, (0.935% faster)

substr($var, -1) 100%

strlen() 99.065%

The substr($var, -1) test took 0.9501 seconds.
The strlen() test took 0.9591 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 249,661 loops for a total of 4,993,220 runs.

Line execution difference (0.000002) milliseconds.
Avg difference (0.449) milliseconds per 249,661 loops.
Total difference 8.97 milliseconds for 4,993,220 loops

The iteration variablity for Code 1 was (3.7720) milliseconds and Code 2 was (3.7962) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

The first test, "substr($var, -1)", was:

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = substr($GLOBALS['dummy'], -1);

The second test, "strlen()", was:

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = substr($GLOBALS['dummy'], strlen($GLOBALS['dummy']) - 1);

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