switch ($_SERVER["SCRIPT_NAME"]) {

 <?php 
echo $_SERVER['PHP_SELF'];
echo "<br>";

 echo $_SERVER['SERVER_NAME'];
echo "<br>";
echo $_SERVER['HTTP_HOST'];

 echo "<br>";
echo $_SERVER['HTTP_REFERER'];
echo "<br>";
echo $_SERVER['HTTP_USER_AGENT'];
echo "<br>";
echo $_SERVER['SCRIPT_NAME'];
?>