Test: substr negative vs. strlen

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Result: Saved

The test labeled "substr($var, -1)" was the faster by 0.0199 seconds, (3.677% faster)

substr($var, -1) 100%

strlen() 96.323%

The substr($var, -1) test took 0.5226 seconds.
The strlen() test took 0.5425 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 122,336 loops for a total of 2,446,720 runs.

Line execution difference (0.000008) milliseconds.
Avg difference (0.997) milliseconds per 122,336 loops.
Total difference 19.95 milliseconds for 2,446,720 loops

The iteration variablity for Code 1 was (2.8759) milliseconds and Code 2 was (2.7385) 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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