   #PHP Manual References Explained Unsetting References Security

                  PHP Manual
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Spotting References

   Many syntax constructs in PHP are implemented via referencing
   mechanisms, so everything told above about reference binding also
   apply to these constructs. Some constructs, like passing and returning
   by-reference, are mentioned above. Other constructs that use
   references are:

global References

   When you declare variable as global $var you are in fact creating
   reference to a global variable. That means, this is the same as:

   <?php
   $var =& $GLOBALS["var"];
   ?>

   That means, for example, that unsetting $var won't unset global
   variable.

$this

   In an object method, $this is always reference to the caller object.
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