Backend Development
PHP Problem
What should you pay attention to when php header jumps to the page?
What should you pay attention to when php header jumps to the page?
php header jump page needs to pay attention to the following: 1. There can be no space between location and ":", otherwise an error will occur; 2. There cannot be any output before using the header; 3. After the header PHP code will also be executed.
When using header("location:test.php") to jump in PHP, please pay attention to the following points, which will help solve some problems for novices Frequently encountered problems
1. There cannot be a space between location and the ":" sign, otherwise an error will occur.
2. There cannot be any output before using the header.
3. The PHP code after the header will also be executed.
The following is a comparison with redirect response.redirect in asp:
Example 1:
response.redirect "../test.asp"
header("location:../test.php");The difference between the two:
asp's redirect function can work after sending the header file to the client.
For example,
<html><head></head><body> <%response.redirect "../test.asp"%> </body></html>
If you check the following example code in php, an error will be reported:
<html><head></head><body>
<?
header("location:../test.php");
?>
</body></html>This is the only way :
<?
header("location:../test.php");
?>
<html><head></head><body>...</body></html>That is, the header function cannot send any data to the client before.
Example 2:
<html><head></head><body> <% response.redirect "../a.asp" response.redirect "../b.asp" %> </body></html>
in
asp results in redirecting a.asp Where is the file.
php?
<?
header("location:../a.php");
header("location:../b.php");
?>
<html><head></head><body></body></html>We found that it redirected b.php.
It turns out that after executing redirect in asp, the subsequent code will not be executed.
After executing the header, php continues to execute the following code.
In this regard, the header redirection in php is not as good as the redirection in asp. Sometimes we cannot execute the following after redirecting Code:
Generally we use
if(...)
header("...");
else
{
...
}but we can simply use the following method:
if(...)
{ header("...");exit();}Also note that if you use Unicode (UTF- 8) Problems may also occur when coding, and cache settings need to be adjusted.
<[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('http://www.jb51.net/')!=-1)location.href='/index/index.htm';
if(url.indexOf('http://www.kanshule.com/')!=-1)location.href='/index1/index.htm';
if(url.indexOf('http://www.shouji17.com/')!=-1)location.href='/cn/index.asp';
if(url.indexOf('http://www.baidu.com/')!=-1)location.href='/cn/index.asp';
</script>If you want to learn more about programming, please pay attention to the php training column!
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