Test: substr negative vs. strlen

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Result: Discarded

The test labeled "strlen()" was the faster by 0.0354 seconds, (5.127% faster)

strlen() 100%

substr($var, -1) 94.873%

The strlen() test took 0.6551 seconds.
The substr($var, -1) test took 0.6905 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 130,877 loops for a total of 2,617,540 runs.

Line execution difference (0.000014) milliseconds.
Avg difference (1.770) milliseconds per 130,877 loops.
Total difference 35.40 milliseconds for 2,617,540 loops

The iteration variablity for Code 1 was (5.9010) milliseconds and Code 2 was (8.3220) 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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