未定义的索引和无效的 foreach（） 参数 php

问：

我有一个页面，其中显示了用户已保存到MYSQL数据库的项目，并将其与复选框一起回显出来。我希望当用户单击此复选框并单击保存按钮时，记录将被删除，但我在标题中遇到了错误。

显示假期表单。

        <form action="deleteProcess.php">
<?php
        foreach($db->query($sql) as $row)
        {
            echo "<p>" . $row['title'] . "<br \>" . 
                         $row['description'] . "<br \>" . 
                         $row['link'] . "<br \>" .
                         $row['pubDate'] . 
                         "<input type='checkbox' name='del[]' value='$row/['title'/]'/>" . 
                         "</p>";    
        }
?>
        <input type="submit" name="delete" value="submit" />
        </form>

删除进程 .php

foreach($_POST['del'] as $check_value)
        {
            //takes session value and assigns it to a variable so that when a holiday is saved it can be distinguished by user
            $user = $_SESSION['name'];
            //assign the value of previous checkbox to $check
            $check = $check_value;
            //assign xpath query to variable $fav
            $fav = "channel/item [title = \"$check\"]";
            //loads instance of xml file as $holidayDoc
            $holidayDoc = simplexml_load_file('holidays.xml');
            //executes xpath search within holidays.xml and results stored in $favourites
            $favourites = $holidayDoc->xpath($fav);

        //for each element of the associative array $favourites, key will be referred to as $currentFav. 
        foreach($favourites as $currentFav)
        {
            echo "{$currentFav->link}". "<br \>";
            echo "{$currentFav->title}". "<br \>";
            echo "{$currentFav->description}". "<br \>";
            echo "{$currentFav->pubDate} ". "<br \>";
            //sql statement that states which values will be inserted into which column
            $sql = "DELETE FROM `saved_holidays` (`subscriberID`, `link`, `pubDate`, `title`, `description`) 
        VALUES ('$user', '$currentFav->link', '$currentFav->pubDate', '$currentFav->title', '$currentFav->description')";

            //connect to database then execute the sql statement.
            $db->exec($sql);
            //close connection to the database
            $db = null;

错误显示在行上，我不明白为什么它不起作用，任何帮助将不胜感激。foreach($_POST['del'] as $check_value)

注意：未定义索引：del in /var/www/vhosts/numyspace.co.uk/web_users/home/~unn_w11026991/public_html/Ass/deleteProcess.php 上线 14

警告：为 foreach（） 提供的参数无效 /var/www/vhosts/numyspace.co.uk/web_users/home/~unn_w11026991/public_html/Ass/deleteProcess.php 上线 14