Test: substr negative vs. strlen

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Result: Saved

The test labeled "substr($var, -1)" was the faster by 0.0242 seconds, (3.167% faster)

substr($var, -1) 100%

strlen() 96.833%

The substr($var, -1) test took 0.7388 seconds.
The strlen() test took 0.763 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 140,442 loops for a total of 2,808,840 runs.

Line execution difference (0.000009) milliseconds.
Avg difference (1.208) milliseconds per 140,442 loops.
Total difference 24.16 milliseconds for 2,808,840 loops

The iteration variablity for Code 1 was (6.6176) milliseconds and Code 2 was (6.7098) 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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