blocks|key|160799|text|您可以将ob_start()放在文件的开头，使其如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|160800|<?php
ob_start();
include+'somepage.php';

$id+=+$_GET['id'];
$query+=+mysql_query("My+query+is+here");

if(mysql_num_rows($query)==0)+{+header('Location:http://example.com');+}|code-block|syntax|javascript|160801|此外，您还可以回显html重定向：|160802|<?php
if(mysql_num_rows($query)==0)+{+echo+'<meta+http-equiv="refresh"+content="0;+url=http://example.com/">';+die();+}|160803|entityMap^0|4|A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

You can put <code>ob_start()</code> at the beginning of the file, so that it looks like this:

<pre><code>&lt;?php
ob_start();
include 'somepage.php';

$id = $_GET['id'];
$query = mysql_query("My query is here");

if(mysql_num_rows($query)==0) { header('Location:http://example.com'); }
</code></pre>

Also, you can echo html redirect:

<pre><code>&lt;?php
if(mysql_num_rows($query)==0) { echo '&lt;meta http-equiv="refresh" content="0; url=http://example.com/"&gt;'; die(); }
</code></pre>

blocks|key|4666961|text|您需要在文件的开头添加ob_start()，如果此操作仍然不起作用，则还需要添加ob_flush();以完全清除旧的标头。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4666962|++++flush();+//+Flush+the+buffer
++++ob_flush();
++++header("Location:+http://example.com");|code-block|syntax|javascript|4666963|entityMap^0|B|A|14|B|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

You need to add <code>ob_start()</code> at the beginning of the file and if this still does not work then you also need to add <code>ob_flush();</code> to fully flush out the old header. 

<pre><code> flush(); // Flush the buffer
 ob_flush();
 header("Location: http://example.com");
</code></pre>

blocks|key|160922|text|您可能在结束?>后有一个空行，这将导致一些文字空白作为输出发送，从而阻止您进行后续的头调用。请注意，在包含文件中保留关闭?>是合法的，这是避免此问题的一种有用的习惯用法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|160923|ob_start()可能会解决您的问题。|offset|length|style|CODE|160924|<html>
<?php
/*+This+will+give+an+error.+Note+the+output
+*+above,+which+is+before+the+header()+call+*/
header('Location:+http://www.example.com/');
exit;
?>|code-block|syntax|javascript|160925|entityMap^0|0|0|A|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You may have a blank line after a closing ?> This will cause some literal whitespace to be sent as output, preventing you from making subsequent header calls. Note that it is legal to leave the close ?> off the include file, which is a useful idiom for avoiding this problem.

<code>ob_start()</code> may fix your problem.

<pre><code>&lt;html&gt;
&lt;?php
/* This will give an error. Note the output
 * above, which is before the header() call */
header('Location: http://www.example.com/');
exit;
?&gt;
</code></pre>

blocks|key|160983|text|“标题已发送错误”意味着您的脚本(somepage.php)已经将标题发送到浏览器，因此您不能更改这些标题并将用户重定向到其他URL。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|160984|最好的解决方案是在检查后移动"include“运算符：|160985|$id+=+$_GET['id'];
$query+=+mysql_query("My+query+is+here");

if(mysql_num_rows($query)==0)+{+header('Location:http://example.com');+}

include('somepage.php');|code-block|syntax|javascript|160986|此外，您还可以阻止somepage.php向客户端发送任何数据。|160987|第二个变体是使用函数ob_start()、ob_get_contents()、ob_end_clean()：|160988|ob_start();
include('somepage.php');

$id+=+$_GET['id'];
$query+=+mysql_query("My+query+is+here");

if(mysql_num_rows($query)==0)+{+header('Location:http://example.com');+}
$content+=+ob_get_contents():
ob_end_clean();
echo+$content;|160989|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|V|8|@]|9|@]|A|$G|H]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

"headers already sent error" means that your script (somepage.php) already sent headers to the browser, so you can't change these headers and redirect user to the other URL.

The best solution is to move the "include" operator after your check:

<pre><code>$id = $_GET['id'];
$query = mysql_query("My query is here");

if(mysql_num_rows($query)==0) { header('Location:http://example.com'); }

include('somepage.php');
</code></pre>

Also, you can prevent your somepage.php from sending any data to the client.

The second variant is to use the functions ob_start(), ob_get_contents(), ob_end_clean():

<pre><code>ob_start();
include('somepage.php');

$id = $_GET['id'];
$query = mysql_query("My query is here");

if(mysql_num_rows($query)==0) { header('Location:http://example.com'); }
$content = ob_get_contents():
ob_end_clean();
echo $content;
</code></pre>

I have a page structured like below and I am having issues getting the redirect to work. This page gets an ID from the URL and uses it in the query. If there isn't a match, just redirect to another page.

I am getting the "headers already sent error," due to the include. I need the include to be there regardless. Is there a different way I can do the redirect if the query result is empty?

<pre><code>include('somepage.php');

$id = $_GET['id'];
$query = mysql_query("My query is here");

if(mysql_num_rows($query)==0) { header('Location:htp://example.com'); }
</code></pre>

I've tried using exit(); and the various stop processing functions.

somepage.php:

<pre><code>&lt;html&gt;
&lt;head&gt;
(standard html)
include('sql-connect.php');
&lt;/head&gt;

&lt;body&gt;
(code to format the header portion of the site)
</code></pre>

Using header() to redirect after using include()

我有一个像下面这样的页面结构，我有问题重定向到工作。此页从URL获取ID并在查询中使用它。如果没有匹配，只需重定向到另一个页面。由于包含，我得到了"headers already error“。我需要include不管怎样都在那里。如果查询结果为空，有没有不同的重定向方法？include('somepage.php')...

问在使用include()之后使用header()重定向
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