利用php语法中NOT IN排除多个字段功能

<?php
// 连接数据库
$conn = new mysqli("localhost", "root", "", "myDB");
 
// 检查连接是否成功
if ($conn->connect_error) {
  die("连接失败: " . $conn->connect_error);
}
 
// 查询并排除不等于指定角色的记录
$roles = "'admin','editor'";
$sql = "SELECT * FROM users WHERE role NOT IN ($roles)";
$result = $conn->query($sql);
 
if ($result->num_rows > 0) {
  while($row = $result->fetch_assoc()) {
    echo "ID: " . $row["id"]. " - 姓名: " . $row["name"]. " - 角色: " . $row["role"]. "<br>";
  }
} else {
  echo "没有符合条件的记录";
}
 
// 关闭数据库连接
$conn->close();
?>