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).
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