Description:
------------
I've tried to use the given regex for testing of my classname (which is 
dynamically built from various sources) but it seems that the given regex allows 
characters which shouldnt be allowed.

The page http://php.net/manual/en/language.oop5.basic.php gives the '^[a-zA-
Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*' regex. But this would allow not only strange 
characters like '»×' which might be intened but also 'a:' which ofcourse would 
fail from a parse error... 



Test script:
---------------
<?php
$controllerName = 'a:';

var_dump(preg_match('/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*/', $controllerName));
eval('class '.$controllerName.' {}');
exit;

Expected result:
----------------
I'd expect the parse error, but also the not the valid pregmatch. thus:

int 0
( ! ) Parse error: syntax error, unexpected ':', expecting '{' in test.php(5) : 
eval()'d code on line 1

Actual result:
--------------
int 1
( ! ) Parse error: syntax error, unexpected ':', expecting '{' in test.php(5) : 
eval()'d code on line 1