way to specify class's type of an object in PHP

Question

Is there a way to specify an object's attribute's type in PHP ? for example, I'd have something like :

class foo{
 public bar $megacool;//this is a 'bar' object
 public bar2 $megasupercool;//this is a 'bar2' object
}


class bar{...}
class bar2{...}

If not, do you know if it will be possible in one of PHP's future version, one day ?

Answer 1

In addition to the TypeHinting already mentioned, you can document the property, e.g.

class FileFinder
{
    /**
     * The Query to run against the FileSystem
     * @var \FileFinder\FileQuery;
     */
    protected $_query;

    /**
     * Contains the result of the FileQuery
     * @var Array
     */
    protected $_result;

 // ... more code

The @var annotation would help some IDEs in providing Code Assistance.