从数据库发送电子邮件到多个地址

Question

我正在尝试制作一个小联系表单，我可以在其中向数据库中的多个用户发送电子邮件，我只是选择所有电子邮件，然后使用while循环发送到每个，但它是只发送到我的数据库中的第一封电子邮件，而不是其余的..我无法弄清楚我哪里出错了

if(isset($_POST['submit'])) {
  $body= $_POST['body'];
  $subject= $_POST['subject'];
  $user = $_SESSION["name"];

  $sql = "SELECT * FROM $user";
  $result = $conn->query($sql);

  while($row = mysqli_fetch_array($result)){
      $email = $row["contact_email"];
      mail($email, $subject, $body,'From: myemail@gmail.com');
  }
}

Answer 1

假设您有以下表格：

用户

+---------+-----------------+
| user_id |      email      |
+---------+-----------------+
|       1 | boss1@boss.com  |
|       1 | boss2@boss.com  |
|       1 | boss3@boss.com  |
|       2 | boris1@boss.com |
|       2 | boris2@boss.com |
+---------+-----------------+

create table emails(
 user_id int references users(id),
 email varchar(255) not null
);

电子邮件

if(isset($_POST['submit'])) {
  $body = $_POST['body'];
  $subject = $_POST['subject'];
  $user = mysqli::real_escape_string($_SESSION["name"]);

  $result = $conn->query("SELECT id from users where name='".$user."'");
  $row = mysqli_fetch_array($result);
  $user_id = intval($row["id"]);

  $sql = "SELECT email FROM emails where user_id=".$user_id;
  $result = $conn->query($sql);

  while($row = mysqli_fetch_array($result)){
      $email = $row["email"];
      mail($email, $subject, $body,'From: myemail@gmail.com');
  }
}

请注意 user_id 对用户表的引用。

现在用PHP

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