Fixed: test failing with PHP 5.5

As of 5.5.0beta3
(https://github.com/php/php-src/commit/05016b7e960148b0d2d5bde279c22e05bc42d518)
"^" is used to compute a XOR, aside the other "|" and "&" operators.

Strings in configuration files should ideally always be escaped for
parse_ini_*() functions to work properly;

Linked to PHP issue 64523