$sql="(INSERT INTO as_registration (roll, registrationid, fullname, username,
       password, dob, courseid, email, gender, phoneno, status)
       VALUES ('".$roll."','".$regid."','".$name."','".$username."','"
       .$pwd."','".$dob."',".intval($c_id['courseid']).",'".$email."','"
       .$gender."',".$phone.",'".$status."'))";

$sql="INSERT INTO as_registration (roll, registrationid, fullname, username, password, dob, courseid, email, gender, phoneno, status ) VALUES ('$roll','$regid','$name','$username','$pwd','$dob',{c_id['courseid']} ,'$email','$gender',$phone,'$status')"

$sql = "
INSERT INTO
    as_registration (roll, registrationid, fullname, username, password, dob, courseid, email, gender, phoneno, status )
VALUES
    ('". mysql_real_escape_string($roll) ."','". mysql_real_escape_string($regid) ."','"
       . mysql_real_escape_string($name) ."','". mysql_real_escape_string($username) ."','"
       . mysql_real_escape_string($pwd) ."','". mysql_real_escape_string($dob) ."',"
       . mysql_real_escape_string(intval($c_id['courseid'])) .",'". mysql_real_escape_string($email) ."','"
       . mysql_real_escape_string($gender) ."','". mysql_real_escape_string($phone) ."','". mysql_real_escape_string($status) ."')";

$sql="INSERT INTO as_registration (roll, registrationid, fullname, username, password, dob, courseid, email, gender, phoneno, status )
      VALUES ('$roll', '$regid', '$name', '$username', '$pwd', '$dob', ".intval($c_id['courseid']).", '$email', '$gender', $phone, '$status')";

$courceid = intval($c_id['courseid']);
$sql="(INSERT INTO as_registration
(roll, registrationid, fullname, username, password, dob, courseid, email, gender, phoneno, status )
VALUES
('$roll','$regid','$name','$username','$pwd','$dob','$courceid','$email','$gender','$phone','$status'))";