html - Database won't update values with php form -


i trying make small form can update value database, won't work.. i've read different questions , answers on topic can't manage work.

here's code:

    <?php     include_once("php_includes/check_login_status.php");      $u = "";     $country = "";      if(isset($_get["u"])){         $u = preg_replace('#[^a-z0-9]#i', '', $_get['u']);     } else {         header("location: index.html");         exit();      }  //a lot of other code other queries          $sql = "select * users username='$u' , activated='1'";         $user_query = mysqli_query($db_conx, $sql);          mysqli_query($db_conx,"update  set country='$_post[country]' username='$_post[u]' ");          if($result){         echo "succesful";          }          else {         echo "error";         }          ?>          <form method="post" />              <p><span>country: </span><input type="text" name="country" id="country" value="<?php echo $country; ?>"></p>              <p><input class="submit" name="submit"type="submit"  value="save">          </form>

anyone can see what's wrong code? thanks! 

$country = $_post['country'];  mysqli_query($db_conx,"update users set country='$country' username='$u' ");

you did not mention table in update statement. , $_post name must quoted in [].


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