Test: substr negative vs. strlen

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Result: Discarded

The test labeled "substr($var, -1)" was the faster by 0.0199 seconds, (1.544% faster)

substr($var, -1) 100%

strlen() 98.456%

The substr($var, -1) test took 1.2667 seconds.
The strlen() test took 1.2866 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 250,743 loops for a total of 5,014,860 runs.

Line execution difference (0.000004) milliseconds.
Avg difference (0.993) milliseconds per 250,743 loops.
Total difference 19.87 milliseconds for 5,014,860 loops

The iteration variablity for Code 1 was (7.0751) milliseconds and Code 2 was (7.5691) 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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