1.下面是我寫入RDS的程式碼

<?php
include('connect.php');
if(!empty($_POST['personID'])){
   $personID=$_POST['personID'];
   $password=($_POST['password']);
   $name=$_POST['name'];
   $gender=$_POST['gender'];
   $date=$_POST['date'];
   $sql2="INSERT INTO kpmg  VALUES('$personID','$password','$name','$gender','$date');";
   mysqli_query($link,$sql2);
   echo "<script> {window.alert('註冊成功！');location.href='index.php'} </script>";
  }
?>

這在我本機端測試的時候都可以寫入，但是當connect換成RDS的時候雖會顯示註冊成功但卻沒有寫入資料庫內了，誰可以幫我解答一下:(

2.下面這個問題也是我connect換成RDS所出現了

include('connect.php');
if(!empty($_POST['personID'])){
  $personID=$_POST['personID'];
  $password=($_POST['password']);
  $sql="SELECT * FROM kpmg Where personID='$personID' && password='$password'";
  $ro=mysqli_query($link,$sql);
  $row=mysqli_fetch_assoc($ro);
  $total=mysqli_num_rows($ro);
  if($total==1){
     echo "登入成功!";
     $_SESSION['acc']=$row['personID'];
     $_SESSION['name']=$row['name'];
     $_SESSION['gender']=$row['gender'];
     $_SESSION['date']=$row['date'];
     header('location:index.php');
  }else{
    echo "<script> {window.alert('尚未註冊或是帳號密碼錯誤！');location.href='crein.php'} </script>";
  }
}
?>

也是在我本機端測試時可以登入，但是換成RDS後出現了下面的錯誤

我應該要改甚麼才可以讓他在正常運行呢?