http://192.168.0.88/testserver88/comset0dele.php?select2=91?select3=034004 use get method php mysql

http://192.168.0.88/testserver88/comset0dele.php?select2=91?select3=034004

my code is below i want the value of 034004  but I don no how to do that be cause when i echo it give me

91?select3=034004

<?php require_once('../Connections/host88.php'); 
$selectrow2 = $_GET['select2'] ;
$selectrow3 = $_GET['select3'] ;
echo "$selectrow2  $selectrow3 ";
/* mysql_query("DELETE FROM ComSetDetail WHERE idComSetDetail ='$selectrow2'; UPDATE  `prdmas` SET OnHand = OnHand+1 WHERE `Code` = '$selectrow3 ';");
*/
 
?>

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