Description:
------------
the pcre extension contains a copy of some specific version of libpcre, with most of the names prefixed with php_ except for _pcre_utt_names which is not prefixed. this means that if a libphp user such as apache2 also happens to load libpcre (mine's directly linked against it so it loads before libphp), the symbols from the latter may override _pcre_utt_names and libphp will use the wrong names table when analyzing \p and \P (the indices would come from php__pcre_utt which is specific for the _pcre_utt_names table contained in the pcre extension).

Reproduce code:
---------------
preg_match_all("/\pL/u", "php", $matches);
print_r($matches);

Expected result:
----------------
Array
(
    [0] => Array
        (
            [0] => p
            [1] => h
            [2] => p
        )

)


Actual result:
--------------
Warning: preg_match_all() [function.preg-match-all]: Compilation failed: unknown property name after \P or \p at offset 3 in <test.php> on line <x>