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What References Are Not

As said before, references aren't pointers. That means, the following construct won't do what you expect:

  <?php 
 function  foo (& $var ) 
{ 
     $var  =&  $GLOBALS [ "baz" ]; 
} 
 foo ( $bar );  
 ?>

What happens is that $var in foo will be bound with $bar in caller, but then it will be re-bound with $GLOBALS["baz"]. There's no way to bind $bar in the calling scope to something else using the reference mechanism, since $bar is not available in the function foo (it is represented by $var, but $var has only variable contents and not name-to-value binding in the calling symbol table). You can use returning references to reference variables selected by the function.

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