这是我的数据库更新和删除代码 但我有这个错误 首先，当打开这个文件名是主题时，即使我没有上传或删除任何内容，我也会收到此消息。就在我打开这个文件的时候。
(Notice: Undefined index: page in C:\xampp\htdocs\art-legend\12\admin\topics.php on line 73)
第二个错误是我更新任何行时。这是工作，但我有这样的信息：
(Notice: Undefined index: topic in C:\xampp\htdocs\art-legend\12\admin\edit.php on line 8)
第三个错误，当我删除它的任何行时，我有这个消息：
(Notice: Undefined index: page in C:\xampp\htdocs\art-legend\12\admin\topics.php on line 73)
和
(Notice: Undefined index: hiddencounter in C:\xampp\htdocs\art-legend\12\admin\topics.php on line 211)
这是我的全部代码：
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script>
$(document).ready(function() {$("tr:odd").addClass("odd");});
</script>
<style type="text/css">
.odd{
background-color:#ccc;
}
div.pagination {
padding: 3px;
margin: 3px;
}
div.pagination a {
padding: 2px 5px 2px 5px;
margin: 2px;
border: 1px solid #AAAADD;
text-decoration: none; /* no underline */
color: #000099;
}
div.pagination a:hover, div.pagination a:active {
border: 1px solid #000099;
color: #000;
}
div.pagination span.current {
padding: 2px 5px 2px 5px;
margin: 2px;
border: 1px solid #000099;
font-weight: bold;
background-color: #000099;
color: #FFF;
}
div.pagination span.disabled {
padding: 2px 5px 2px 5px;
margin: 2px;
border: 1px solid #EEE;
color: #DDD;
}
</style>
<?php
/*
Place code to connect to your DB here.
*/
$connect=mysqli_connect('localhost','root','adminpass','flip'); // include your code to connect to DB.
$tbl_name="threads"; //your table name
// How many adjacent pages should be shown on each side?
$adjacents = 3;
/*
First get total number of rows in data table.
If you have a WHERE clause in your query, make sure you mirror it here.
*/
$query = "SELECT COUNT(*) as num FROM $tbl_name";
$total_pages = mysqli_fetch_array(mysqli_query($connect,$query));
$total_pages = $total_pages['num'];
/* Setup vars for query. */
$targetpage = "topics.php"; //your file name (the name of this file)
$limit = 10; //how many items to show per page
$page = $_GET['page'];
if($page)
$start = ($page - 1) * $limit; //first item to display on this page
else
$start = 0; //if no page var is given, set start to 0
/* Get data. */
$sql = "SELECT id,topic FROM $tbl_name order by id DESC LIMIT $start, $limit";
$result = mysqli_query($connect,$sql);
/* Setup page vars for display. */
if ($page == 0) $page = 1; //if no page var is given, default to 1.
$prev = $page - 1; //previous page is page - 1
$next = $page + 1; //next page is page + 1
$lastpage = ceil($total_pages/$limit); //lastpage is = total pages / items per page, rounded up.
$lpm1 = $lastpage - 1; //last page minus 1
/*
Now we apply our rules and draw the pagination object.
We're actually saving the code to a variable in case we want to draw it more than once.
*/
$pagination = "";
if($lastpage > 1)
{
$pagination .= "<div class=\"pagination\">";
//previous button
if ($page > 1)
$pagination.= "<a href=\"$targetpage?page=$prev\">previous</a>";
else
$pagination.= "<span class=\"disabled\">previous</span>";
//pages
if ($lastpage < 7 + ($adjacents * 2)) //not enough pages to bother breaking it up
{
for ($counter = 1; $counter <= $lastpage; $counter++)
{
if ($counter == $page)
$pagination.= "<span class=\"current\">$counter</span>";
else
$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";
}
}
elseif($lastpage > 5 + ($adjacents * 2)) //enough pages to hide some
{
//close to beginning; only hide later pages
if($page < 1 + ($adjacents * 2))
{
for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++)
{
if ($counter == $page)
$pagination.= "<span class=\"current\">$counter</span>";
else
$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";
}
$pagination.= "...";
$pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
$pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";
}
//in middle; hide some front and some back
elseif($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2))
{
$pagination.= "<a href=\"$targetpage?page=1\">1</a>";
$pagination.= "<a href=\"$targetpage?page=2\">2</a>";
$pagination.= "...";
for ($counter = $page - $adjacents; $counter <= $page + $adjacents; $counter++)
{
if ($counter == $page)
$pagination.= "<span class=\"current\">$counter</span>";
else
$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";
}
$pagination.= "...";
$pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
$pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";
}
//close to end; only hide early pages
else
{
$pagination.= "<a href=\"$targetpage?page=1\">1</a>";
$pagination.= "<a href=\"$targetpage?page=2\">2</a>";
$pagination.= "...";
for ($counter = $lastpage - (2 + ($adjacents * 2)); $counter <= $lastpage; $counter++)
{
if ($counter == $page)
$pagination.= "<span class=\"current\">$counter</span>";
else
$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";
}
}
}
//next button
if ($page < $counter - 1)
$pagination.= "<a href=\"$targetpage?page=$next\">next </a>";
else
$pagination.= "<span class=\"disabled\">next </span>";
$pagination.= "</div>\n";
}
?>
<form action="" method="post">
<?php
echo "<table border='1' width='50%' cellpadding='0' cellspacing='0'";
?>
<tr>
<td>Id</td>
<td>Subject</td>
<td>#</td>
<td>#</td>
<td>Del</td>
</tr>
<?
while($row=mysqli_fetch_object($result)){
?>
<tr>
<td><? echo $row->id; ?></td>
<td><? echo $row->topic; ?></td>
<td><a href='edit.php?id=<? echo $row->id; ?>'>Update</a></td>
<td><input type="checkbox" name="checkbox[]" value="<?php echo $row->id ; ?>"></td>
<td><input type="submit" name="delete" value="delete" ></td>
<?
}
echo "</table>";
$num=mysqli_num_rows($result);
if(isset($_POST['delete'])){ /* IF DELETE IS CLICKED */
$checkbox=$_POST['checkbox'];
$hiddencounter=mysqli_real_escape_string($connect,$_POST['hiddencounter']); /* PREVENT A BIT OF SQL INJECTION */
for($i=0;$i<$hiddencounter;$i++){ /* FOR LOOP BASED ON THE NUMROWS BELOW */
if(!empty($checkbox[$i])){ /* IF THE CHECKBOX IS TICKED */
$del_id=mysqli_real_escape_string($connect,$checkbox[$i]); /* PREVENT A BIT OF SQL INJECTION */
$sql2="DELETE FROM threads WHERE id='$del_id'";
$query2=mysqli_query($connect,$sql2); /* IMPLEMENT THE DELETE QUERY */
}
if($i==$hiddencounter){ /* IF FOR LOOP ENDS */
echo "<meta http-equiv=\"refresh\" content=\"0;URL=delete.php\">";
}
}
}
?>
</form>
<?=$pagination?>
<?php
if($connect=mysqli_connect('localhost','root','adminpass','flip')) {
$id = $_GET["id"];
$topic = $_GET["topic"];
$sql="SELECT * from threads WHERE id='$id'";
$query=mysqli_query($connect,$sql);
while($row=mysqli_fetch_object($query)) {
?>
<form action="<?php echo $_SERVER["PHP_SELF"];?>" method="get" >
<input type="hidden" name="id" value="<?php echo $row->id; ?>" >
<input type="text" name="topic" value="<?php echo $row->topic; ?>" >
<input type="submit" name="submit" value="Update" >
</form>
<?
}
$sql2="UPDATE threads SET topic= '$topic' WHERE id='$id'";
$query2=mysqli_query($connect,$sql2);
if(isset($_GET['submit'])){
echo "updat done ";
}
}
else {
echo "erro connection ";
}
?>
<h1>delete Done</h1>
<br />
<a href="topic.php">return to Pr</a>
非常感谢
答案 0 :(得分：1)
错误与未定义的索引page，topic，hiddencounter有关。
替换：
$page = $_GET['page'];
使用：
$page = isset($_GET['page']) ? (int)$_GET['page'] : 1;
替换：
$topic = $_GET["topic"];
使用：
$topic = isset($_GET["topic"]) ? (int)$_GET["topic"] : 0;
替换：
$_POST['hiddencounter']
使用：
(isset($_POST['hiddencounter']) ? (int)$_POST['hiddencounter'] : 0)
答案 1 :(得分：0)
$checkbox=$_POST['checkbox'];
$page = $_GET['page'];
$id = $_GET["id"];
$topic = $_GET["topic"];
这些应该以{{1}}开头，如果没有设置则默认为某些内容（或者其他代码应该在if子句中。
答案 2 :(得分：0)
尝试把它放在第一位
$page = isset($_GET['page']) ? intval($_GET['page']) : 1;
和
$topic = isset($_GET["topic"]) ? intval($_GET["topic"]) : 0;
并替换猎人检查