Added the note about passing 0 as base to intval() to autodetect the base for conversion.

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Provided by anonymous #27711 (d.chekaliuk@invisilabs.com)

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@331179 c90b9560-bf6c-de11-be94-00142212c4b1