Test: substr negative vs. strlen

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Result: Discarded

The test labeled "substr($var, -1)" was the faster by 0.007 seconds, (0.637% faster)

substr($var, -1) 100%

strlen() 99.363%

The substr($var, -1) test took 1.0958 seconds.
The strlen() test took 1.1028 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 291,170 loops for a total of 5,823,400 runs.

Line execution difference (0.000001) milliseconds.
Avg difference (0.351) milliseconds per 291,170 loops.
Total difference 7.02 milliseconds for 5,823,400 loops

The iteration variablity for Code 1 was (5.9522) milliseconds and Code 2 was (5.7403) 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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