   #PHP Manual References Explained Returning References Spotting
   References

                  PHP Manual
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Unsetting References

   When you unset the reference, you just break the binding between
   variable name and variable content. This does not mean that variable
   content will be destroyed. For example:

   <?php
   $a = 1;
   $b =& $a;
   unset ($a);
   ?>

   won't unset $b, just $a.

   Again, it might be useful to think about this as analogous to Unix
   unlink call.
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