   #PHP Manual References Explained Passing by Reference Unsetting
   References

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Returning References

   Returning by-reference is useful when you want to use a function to
   find which variable a reference should be bound to. When returning
   references, use this syntax:

   <?php
   function &find_var ($param)
   {
       /* ...code... */
       return $found_var;
   }
   $foo =& find_var ($bar);
   $foo->x = 2;
   ?>

   In this example, the property of the object returned by the find_var
   function would be set, not the copy, as it would be without using
   reference syntax.

     Note: Unlike parameter passing, here you have to use & in both
     places - to indicate that you return by-reference, not a copy as
     usual, and to indicate that reference binding, rather than usual
     assignment, should be done for $foo.
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