Sometimes I get confused with what result a server variables would return.  For example between the $_SERVER[‘SCRIPTNAME’] and $_SERVER[‘SCRIPT_FILENAME’].

Use the following code to display all server variables. From there you can decide which server variable is suitable to use.

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echo "<table>";
foreach($_SERVER as $key=>$value)
        echo "<tr><td>$key</td><td>$value</td></tr>";
echo "</table>";