Email Verification using PHP- Status Changes by opening an email rather than clicking on link

Question

Email verification status changes from "non-verified" to "Verified" by opening verification email rather than clicking on the verification link. Kindly identify the issue

Here is my code:

session_start();
include('header.php');
include('admin/includes/connection.php');
$msg="";
$emailis=$_GET['email'];
$codis =$_GET['v_code'];
if(isset($_GET['email']) && isset($_GET['v_code'])) {   
$query="select * from users where email='$_GET[email]' and v_code='$_GET[v_code]'";
$result=mysqli_query($con,$query);
if($result)
{ 
   if(mysqli_num_rows($result)==1)
   {
    $row = mysqli_fetch_array($result);
    if($row['status']==0)
    {
        $update="update users set status=1 where email='$emailis' and v_code='$codis'";
        
         if(mysqli_query($con,$update))
           {
               $msg="Account has been verified.";
           }
           else
           {
               $msg ="Some issue in running query";
           }
    }
    else
    {
        $msg="Username is already verified";
    }
 }
   else
   {
       $msg="Zero Record";
   } 
}
else
{
    $msg="Cannot run query";
}

}