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php-manual-en-4.3.0-2mdk.noarch.rpm

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>&#13;    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:
   </P
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>global</TT
> References</H2
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>&#13;     When you declare variable as <B
CLASS="command"
>global $var</B
> you
     are in fact creating reference to a global variable. That means,
     this is the same as:
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    </P
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>&#13;     That means, for example, that unsetting <TT
CLASS="varname"
>$var</TT
>
     won't unset global variable.
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><TT
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>$this</TT
></H2
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>&#13;     In an object method, <TT
CLASS="varname"
>$this</TT
> is always reference
     to the caller object.
    </P
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