[PHP] How to display ALL session variables?

[Ronald Wiplinger]

Is there a simple way to display all session variables? Like the code 
below I use in debug for all posted variables:

echo "<h3>posted variables</h3>";
 while (list($name, $value) = each($HTTP_POST_VARS)) {
   echo "$name = $value<br>\n";
 }
bye

Ronald

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