[英]Cannot modify header information headers already sent by output
Delete image than redirect the page with query string i add query string with header but its not working Header not working 删除图片而不是使用查询字符串重定向页面我添加了带有标题的查询字符串,但是它不起作用标题不起作用
Error 错误
headers already sent by output started at sidebar.php in delete.php 已由输出发送的标头从delete.php中的sidebar.php开始
Delete.php Delete.php
if(!isset($_SESSION['admin_email'])){
echo "<script>window.open('login.php','_self')</script>";
}
else {
if(isset($_GET['delete'])){
$id = $_GET['delete'];
$page = $_GET['page'];
$image = $_GET['image'];
$section = $_GET['section'];
$delete_p_cat = "delete from $page where id='$id' AND section = '$section'";
$run_delete = mysqli_query($con,$delete_p_cat);
if($run_delete)
{
header('Location: index.php?view&page='.$page.'§ion='.$section);
exit();
}
}
} ?>
index page check if page exist than load the page sidebar included in index page index.php 索引页面检查页面是否存在,而不是加载索引页面index.php中包含的页面侧边栏
<div id="wrapper">
<?php include("includes/sidebar.php"); ?>
<div id="page-wrapper">
<div class="container-fluid">
<?php
if(isset($_GET['dashboard'])){
include("dashboard.php");
}
if(isset($_GET['view'])){
include("view.php");
}
if(isset($_GET['delete'])){
include("delete.php");
}
</div>
</div>
</div>
You are getting this error because you are already outputting content before setting a header. 之所以出现此错误,是因为在设置标题之前已经输出了内容。
If your include("delete.php");
如果您的
include("delete.php");
is going to redirect then you will need to perform this before outputting content. 要重定向,那么您需要在输出内容之前执行此操作。
try... 尝试...
// before any output
if(!isset($_SESSION['admin_email']) && isset($_GET['delete'])){
include("delete.php");
}
?>
<div id="wrapper">
<?php include("includes/sidebar.php"); ?>
<div id="page-wrapper">
<div class="container-fluid">
<?php
if(isset($_GET['dashboard'])){
include("dashboard.php");
}
if(isset($_GET['view'])){
include("view.php");
}
if(isset($_GET['delete'])){
// remove this from delete.php
if(!isset($_SESSION['admin_email'])){
// looking at it, this may also want to be at the top
// if you are checking for a 'logged in user'
echo "<script>window.open('login.php','_self')</script>";
}
}
</div>
</div>
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