Re: [PHP-DEV] Variable Variables and Superglobals

Andi Gutmans Wed, 04 Aug 2004 16:51:55 -0700

Right. Variable variables don't work with super-globals and I think it is documented in this way. This is on purpose as we decided to only support them this way both for clarity reasons and for performance. There are no plans to change this.

Andi

At 01:35 AM 8/5/2004 +0200, A.Rico wrote:

   Using Variable Variables works fine inside functions for global
defined variables if you declare them as global inside the function.
Suprinsingly, it does not seem to work with superglobals. Take the
following example:

// code ////////////////////////////////////////////////////////////

<?php
$glob_var="Var 1";

$var_glob_var="glob_var";
$var_ENV="_ENV";

echo $_ENV["OS"],"\n";
echo $glob_var,"\n\n";

echo $var_glob_var,"\n";
echo $var_ENV,"\n\n";

echo $$var_glob_var,"\n";
echo ${$var_ENV}["OS"],"\n\n";

foo1($var_glob_var);
foo2($var_glob_var);
foo3();
foo4();
foo5($var_ENV);
foo6($var_ENV);
foo7();
foo8();
foo9();

function foo1($arg){
   echo "--- In foo1 --------------\n";
   echo $arg,"\n";
   echo $$arg,"\n";
   echo "--------------------------\n";
}
function foo2($arg){
   global $glob_var;

   echo "--- In foo2 --------------\n";
   echo $arg,"\n";
   echo $$arg,"\n";
   echo "--------------------------\n";
}
function foo3(){
   $arg="glob_var";
   echo "--- In foo3 --------------\n";
   echo $arg,"\n";
   echo $$arg,"\n";
   echo "--------------------------\n";
}
function foo4(){
   global $glob_var;

   $arg="glob_var";
   echo "--- In foo4 --------------\n";
   echo $arg,"\n";
   echo $$arg,"\n";
   echo "--------------------------\n";
}
function foo5($arg){
   echo "--- In foo5 --------------\n";
   echo $arg,"\n";
   echo ${$arg}["OS"],"\n";
   echo "--------------------------\n";
}
function foo6($arg){
   global $_ENV;

   echo "--- In foo6 --------------\n";
   echo $arg,"\n";
   echo ${$arg}["OS"],"\n";
   echo "--------------------------\n";
}
function foo7(){
   $arg="_ENV";

   echo "--- In foo7 --------------\n";
   echo $arg,"\n";
   echo ${$arg}["OS"],"\n";
   echo "--------------------------\n";
}
function foo8(){
   global $_ENV;
   $arg="_ENV";

   echo "--- In foo8 --------------\n";
   echo $arg,"\n";
   echo ${$arg}["OS"],"\n";
   echo "--------------------------\n";
}
function foo9(){
   echo "--- In foo9 --------------\n";
   echo $_ENV["OS"],"\n";
   echo "--------------------------\n";
}
?>

// Output /////////////////////////////////////////////////////////

Windows_NT
Var 1

glob_var
_ENV

Var 1
Windows_NT

--- In foo1 --------------
glob_var

--------------------------
--- In foo2 --------------
glob_var
Var 1
--------------------------
--- In foo3 --------------
glob_var

--------------------------
--- In foo4 --------------
glob_var
Var 1
--------------------------
--- In foo5 --------------
_ENV

--------------------------
--- In foo6 --------------
_ENV

--------------------------
--- In foo7 --------------
_ENV

--------------------------
--- In foo8 --------------
_ENV

--------------------------
--- In foo9 --------------
Windows_NT
--------------------------

// Version //////////////////////////////////////////////

PHP 4.3.7 (cgi-fcgi) (built: Jun  2 2004 15:49:31)
Copyright (c) 1997-2004 The PHP Group
Zend Engine v1.3.0, Copyright (c) 1998-2004 Zend Technologies

// End //////////////////////////////////////////////////

   I'm doing something wrong? Or this is the expected behavior?

Thank you in advance

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Re: [PHP-DEV] Variable Variables and Superglobals

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