我有一个页面,显示用户已保存到MYSQL数据库的项目,并将其与复选框一起回显。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,但我的标题中遇到了错误。
显示假日表单。
<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>
删除过程.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
$db = null;
错误显示在foreach($_POST['del'] as $check_value)
行,我不明白为什么它不起作用,任何帮助将不胜感激。
注意:未定义的索引:del in /var/www/vhosts/numyspace.co.uk/web_users/home/~unn_w11026991/public_html/Ass/deleteProcess.php 在第 14 行
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 在第 14 行
您的del
复选框根本没有从表单中发布。您需要向表单添加method="post"
。
<form action="deleteProcess.php" method="post">
您应该首先检查是否设置了 $_POST['del'],因为如果没有选中复选框,它就不会被选中。
if(isset($_POST['del'])){
foreach($_POST['del'] as $del){}
}
您可以通过 $_POST 访问复选框值,但您的表单标签没有定义方法!你必须设置<form method="POST">
,否则你必须使用$_GET['del']
<form action
中缺少method="post"
。
此外,用于删除的 SQL 语法不正确。从数据库中删除记录时,无需指定列。删除整个记录。
删除语法为:
DELETE FROM table_name WHERE condition
您的表单中缺少method="post"
,因此没有发布任何内容,这是您的问题。
这个错误很清楚。
$_POST['del']
不存在,因为del
不是已发布表单中的有效字段。
如果del
是复选框的名称,则首先必须通过向表单添加post action
来检索它们