Description:
------------
I ran a test of numbers from -1000 to 1000.  I passed the values into 
'ctype_alpha', which I expected ALL output to be "Failure::xx".  However, I 
receive "Success::xx" output on a variety of numbers from -125 to 255.

Test script:
---------------
for ($x = -1000;$x < 1000;$x++) {
   echo ((ctype_alpha ($x)) ? "Success::{$x}" : "Failure::{$x}") . PHP_EOL;
}

Expected result:
----------------
I expect to see nothing but "Failure::{xx}" all the way down.