数据驱动的下拉菜单

Question

我目前有一个 HTML 表单，其中某个下拉菜单的选项是硬编码的。相反，我想使用 PHP 来...

1. 在 MySQL 表（位置）的列（城市）中查找值
2. 使这些值成为下拉菜单中的唯一选项。

任何想法我会如何做到这一点？这是我目前所拥有的。

<?php

 //connect to the database
 $dbc = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);

 //grab the city names from the MySQL table 
 $query = "SELECT cities FROM locations";
 $data = mysqli_query($dbc, $query);

 //close the db connection
 mysqli_close($dbc);

?>

....这里省略了一堆HTML....

<label for="city">What is your destination city?</label>
      <select class="form-control" id="city" name ="city" /><br />
          <option value="$data">$data</option>
      </select>

Answer 1

<label for="city">What is your destination city?</label>
<select class="form-control" id="city" name="city">

<?php
  //connect to the database
  $dbc = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);

  //grab the city names from the MySQL table 
  $query = "SELECT cities FROM locations";

  $res = mysqli_query($dbc, $query);

  while ($data = mysqli_fetch_assoc($res)) {
    echo '<option value="'.$data['cities'].'">'.$data['cities'].'</option>';
  }

  //close the db connection
  mysqli_close($dbc);
?>

</select>