Removed XOR from php.ini

https://bugs.php.net/bug.php?id=64523

`parse_ini_*` does not support XOR operation. http://3v4l.org/6fYNg#v540

Commit where XOR is added:
https://github.com/php/php-src/commit/e0669bf1ab0892132bf6fe6f81587bfba45e7329#L0R50