使用ob_start()和ob_end_flush()的PHP标题问题 [英] PHP Header issue with ob_start() and ob_end_flush()
问题描述
当我在页面的开头使用 ob_start()
并且 ob_end_flush()
在结束。因为我在执行一些查询后使用了头函数。
I get header problem while I use ob_start()
in the beginning of a page and ob_end_flush()
at the end. Because I use header function after some query execution.
ob_start();
include_once("header.php");
global $db;
$countstmt="SELECT COUNT(*) FROM tbl_lib_hours dh WHERE book_id IN(SELECT book_id FROM tbl_book WHERE user_id=".$_SESSION['uid'].") ";
$delHourExist=$db->query($countstmt);
if($delHourExist){
header("location:edit_delivery_hours.php");
}
....
include_once('footer.php');
ob_end_flush();
在 header.php 中,我还添加了 ob_start() ; 和 footer.php 我添加了 ob_end_flush(); ,但我认为这并不是问题,尽管其他页面正在使用上面写的相同脚本运行
In header.php there I also added ob_start(); and in footer.php i added ob_end_flush(); , but I think that is not problem, although other pages are running with same script I write above
我得到的错误:
The error I am getting:
警告:无法修改标题信息 - 头文件已发送到D:\xampp\htdocs\project\add_book_hours.php on line 9
Warning: Cannot modify header information - headers already sent in D:\xampp\htdocs\project\add_book_hours.php on line 9
推荐答案
我有点困惑,警告消息不包括导致第一个内容发送到客户端的代码的位置。 headers_sent()函数也可以返回该位置。因此,为了调试目的,请尝试
I'm a bit baffled the warning message doesn't include the location of the code that caused the first content to be sent to the client. The function headers_sent() can return that location, too. So, for debugging purposes, please try
if($delHourExist)
{
if ( headers_sent($path, $lineno) ) {
echo '<pre>Debug: output started at ', $path, ':', $lineno, "</pre>\n";
}
header("location: edit_delivery_hours.php");
}
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