What are the precautions for using PHP Header to jump to pages?-PHP Problem-php.cn

What are the precautions for using PHP Header to jump to pages?

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Release： 2023-03-04 08:34:01

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Notes on using PHP Header for page jumps: 1. There cannot be a space between location and [:], otherwise an error will occur; 2. There cannot be any output before using the header; 3. After the header The PHP code will also be executed.

What are the precautions for using PHP Header to jump to pages?

Notes on PHP Header used for page jumps:

The following is the redirection in asp## Comparison of #response.redirect:

Example 1:

response.redirect "../test.asp"
header("location:../test.php");

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The difference between the two:

asp’s

redirectThe function can work after sending the header file to the client.

For example,

<html><head></head><body>
<%response.redirect "../test.asp"%>
</body></html>

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If you check the following example code in php, an error will be reported:

<html><head></head><body>
<?
header("location:../test.php");
?>
</body></html>

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This can only be done:

<?
header("location:../test.php");
?>
<html><head></head><body>...</body></html>

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That is, the header function cannot send any data to the customer before.

Example 2:

<html><head></head><body>
<%
response.redirect "../a.asp"
response.redirect "../b.asp"
%>
</body></html>

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The result in

asp is a redirect

a.aspWhere is the file.

php?

<?
header("location:../a.php");
header("location:../b.php");
?>
<html><head></head><body></body></html>

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We found that it redirected

b.php.

originally in After executing redirect in asp, the following code will not be executed.

And php will continue to execute the following code after executing the header.

In this regard, header redirection in php is not as good as asp Redirection in. Sometimes we cannot execute the subsequent code after redirection:

Generally we use

if(...)
header("...");
else
{
...
}

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but we can simply use the following method:

if(...)
{ header("...");exit();}

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It should also be noted that if you are encoding with Unicode (UTF-8), problems will also occur, and you need to adjust the cache settings.

<[email=%@]%@LANGUAGE="VBSCRIPT[/email]" CODEPAGE="936"%>
<%if Request.ServerVariables("SERVER_NAME")="s.jb51.net" then
response.redirect "news/index.htm"
else%>
<%end if%>
<script>
var url = location.href;
if(url.indexOf(&#39;http://www.devdao.com/&#39;)!=-1)location.href=&#39;/index/index.htm&#39;;
if(url.indexOf(&#39;http://www.knowsky.com/&#39;)!=-1)location.href=&#39;/index1/index.htm&#39;;
if(url.indexOf(&#39;http://www.google.com/&#39;)!=-1)location.href=&#39;/cn/index.asp&#39;;
if(url.indexOf(&#39;http://www.baidu.com/&#39;)!=-1)location.href=&#39;/cn/index.asp&#39;;
</script>

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