Test: substr negative vs. strlen

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Result: Discarded

The test labeled "strlen()" was the faster by 0.0124 seconds, (1.160% faster)

strlen() 100%

substr($var, -1) 98.84%

The strlen() test took 1.0548 seconds.
The substr($var, -1) test took 1.0671 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 239,674 loops for a total of 4,793,480 runs.

Line execution difference (0.000003) milliseconds.
Avg difference (0.619) milliseconds per 239,674 loops.
Total difference 12.37 milliseconds for 4,793,480 loops

The iteration variablity for Code 1 was (8.6232) milliseconds and Code 2 was (7.5282) 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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