<5.3.0 returned string("") if the configuration option didn't exist. 
(see https://bugs.php.net/bug.php?id=46811 )

-- 
Provided by Hans Henrik Bergan (divinity76@gmail.com)

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@331211 c90b9560-bf6c-de11-be94-00142212c4b1