问如果数据与数据库完全匹配，Mysqli将更新数据

EN

 $phone = $_GET["phone"];

      $ix=strpos($text_utf8,' ');
      if($ix!==false) {
        $p_n=trim(substr($text_utf8, 0, $ix));
        $msg=trim(substr($text_utf8, $ix+1));

        if(strlen($p_n)!=0 && strlen($msg)!=0) {
          $wrong_format=FALSE;

          $p_n = mysqli_real_escape_string($con, $p_n);
          $msg = mysqli_real_escape_string($con, $msg);


          // creating an sql statement to insert the message into the pin_man table
          $sql="UPDATE smss SET msg='$msg' AND phone='$phone' WHERE p_n='$p_n'";
          // executing the sql statement
          mysqli_query($con,$sql);      
        }
      }