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Subject: Re: [PHP-DEV] Variable Variables and Superglobals
From: el3tro2@tiscali.es ("A.Rico")

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    What the PHP documentation says about variable variables and 
superglobals is that you can't use them as a "pointer":

    /*Warning*/

    / Please note that variable variables cannot be used with PHP's
    Superglobal arrays
    <http://www.php.net/manual/en/language.variables.predefined.php#language.variables.superglobals>.
    This means you cannot do things like ${$_GET}. If you are looking
    for a way to handle availability of superglobals and the old
    HTTP_*_VARS, you might want to try referencing
    <http://www.php.net/manual/en/language.references.php> them. /

what I intended was to use a "normal" globally defined variable to 
"point" to a superglobal; that, in fact, works in the global scope, but 
not in the function scope:

// Code //////////////////////////////////////////////////////////////
$varvar="_ENV";

echo $_ENV["OS"]; // --> Windows NT
echo ${$varvar}; // --> Windows NT

foo($varvar);

function foo($arg){
    $lvar="_ENV";

    echo $_ENV["OS"]; // --> Windows NT
    echo ${$arg}["OS"]; // --> *nothing*
    echo ${$lvar}["OS"]; // --> *nothing*
    var_dump( $$arg ); // --> NULL
    var_dump( $$lvar); // --> NULL
}
// END //////////////////////////////////////////////////////////////

Regards,

A. Rico

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