<input type="radio" name="a<?php echo $i;?>" value="good">good

[pmcalmc]

if(isset($_POST['onsub'])){
      
      for($i=0;$i<4;$i++){
         
                 $t=$_POST["a$i"];
                 
                 echo "hello"."a$i";
                switch ($t){
                      case "good":
                                   $q2 = "update teacher set good=good+1 where teacher_name='$tname'";
                                     $r = mysql_query($q2, $con);
                                        if (!$r)
                                        echo "error";
                                        continue;                                                 
                         case "average":
                                    $q2 = "update teacher set average=average+1 where teacher_name='$tname' ";
                                    mysql_query($q2, $con);
                                    continue;
                      case "excellent":
                                    $q2 = "update teacher set excellent=excellent+1 where teacher_id='$tname'";
                                    mysql_query($q2, $con);
                                    continue;
                     default:
                                    echo "please select one";
 }       

}
}

i want to use a0,a1 ....in loop
plz help me thnk u.....