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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