PHP function comments

I've seen that some PHP functions are commented at the top, using a format that is unknown to me: ``` /** * * Convert an object to an array * * @param object $object The object to convert * @return array * */ ``` My IDE gives me a dropdown selection for the things such as @param and @return, so it must be documented somewhere. I've tried searching google but it won't include the @ symbol in its search. What is this format of commenting and where can I find some information on it?