PHP CMS-添加图像不起作用

Question

我正在创建一个简单的CMS，我希望用户能够在帖子中上传图像。除图像外，该表格正常工作。由于某种原因，我收到此消息"通知：未定义的索引：post_img"。有人可以帮我解决这个问题吗？

谢谢。

代码：

<form method="post" action="add_post.php">
 <?php
        if(isset($_POST['add_post'])) {
            $add_title = $_POST['post_title'];
            $post_img = $_FILES['post_img']['name'];
            $post_img_temp = $_FILES['post_img']['tmp_name'];

            $add_content = $_POST['post_content'];
            move_uploaded_file($post_img_temp, "images/$post_img");
            $add_post_query = "INSERT INTO posts (post_title, post_img, post_content) ";
            $add_post_query .= "VALUES ('$add_title', '$post_img', '$add_content') ";
            mysqli_query($connection, $add_post_query);
        }  
    ?>

        <div class="form-group">
            <label for="post-title">Title</label>
            <input type="text" name="post_title" class="form-control">
        </div>
        <div class="form-group">
            <label for="post-img">Image</label>
            <input type="file" name="post_img" class="form-control">
        </div>
        <div class="form-group">
            <label for="post-content">Content</label>
            <textarea name="post_content" class="form-control"></textarea>
        </div>
        <div class="form-group">
            <input type="submit" name="add_post" class="btn btn-primary" value="Add Post">
        </div>
    </form>

Answer 1

您需要正确放置表单标签。另外，您需要设置表单以通过将enctype属性添加到表单标签

来接受文件

 <form method="post" enctype="multipart/form-data">
<div class="form-group">
            <label for="post-title">Title</label>
            <input type="text" name="post_title" class="form-control">
        </div>
        <div class="form-group">
            <label for="post-img">Image</label>
            <input type="file" name="post_img" class="form-control">
        </div>
        <div class="form-group">
            <label for="post-content">Content</label>
            <textarea name="post_content" class="form-control"></textarea>
        </div>
        <div class="form-group">
            <input type="submit" name="add_post" class="btn btn-primary" value="Add Post">
        </div>
    </form>