Question

我在HTML中有这个表单

<form action="" method="post">
  <div class="tags">
      <label class="tag" for="TAG1"><input type="checkbox" id="TAG1" value="TAG1" name="tags[]">TAG1</label>
      <label class="tag" for="TAG2"><input type="checkbox" id="TAG2" value="TAG2" name="tags[]">TAG2</label>
      <label class="tag" for="TAG3"><input type="checkbox" id="TAG3" value="TAG3" name="tags[]">TAG3</label>
      <label class="tag" for="TAG4"><input type="checkbox" id="TAG4" value="TAG4" name="tags[]">TAG4</label>
      <label class="tag" for="TAG5"><input type="checkbox" id="TAG5" value="TAG5" name="tags[]">TAG5</label>
  </div>
        <button type="submit" name="submit">submit</button>
</form>

然后这是我的PHP简介

if(isset($_POST['submit'])){
        $tag = $_POST['tags']
        $query = "
        SELECT a.title FROM posts a
        INNER JOIN tags b ON a.id = b.pid
        WHERE b.tag IN (:tag)
        ";
        $stmt = $pdo->prepare($query);
        $stmt->execute(['tag' => $tag]);
    }

如何在我的代码查询中准确搜索多个选定的标签？我一直在

Notice: Array to string conversion

Answer 1

MySql IN接受由comma(,)分隔的字符串，并且您正在将数组传递给其中，因此您将收到警告消息，只是将您的标记数组内爆以使其成为字符串

if(isset($_POST['submit'])){
    $tag = implode(",",$_POST['tags']);
    $query = "
    SELECT a.title FROM posts a
    INNER JOIN tags b ON a.id = b.pid
    WHERE b.tag IN (:tag)
    ";
    $stmt = $pdo->prepare($query);
    $stmt->execute(['tag' => $tag]);
}

具有多个标签的PDO搜索查询

1 个答案: