When I click on "Add Country", localhost says : Uploading failed, please try again. Can you tell me where is the mistake please ?
<?php
    $db = new mysqli('localhost', 'root', '', 'db');
    if(isset($_POST["submit"]))
    {
        $c_code = addslashes($_POST["c_code"]);
        $c_name = addslashes($_POST["c_name"]);
        $c_key = addslashes($_POST["c_key"]);
        {
          $sql = "insert into countries(country_code, country_name, country_key) values('$c_code', '$c_name', '$c_key')";
          $rs = mysqli_query($db, $sql);
          if($rs)
          {
            echo "<script> alert('Country uploaded successfully') </script>";
          }
          else
          {
            echo "<script> alert('Uploading failed, please try again.') </script>";
          } 
        }
    }
?>
 
    