Use PHP header for page jump problems troubleshoot _php tutorial

When we go on page jumps, we usually use

In PHP with the header ("location:test.php") to jump to pay attention to the following points, to help solve some of the problems novice often encountered

1, location and ":" No space between, otherwise it will be wrong.
2, before using the header can not have any output.
3. The PHP code after the header will also be executed.

Here is a comparison with the redirect Response.Redirect in asp:

Example 1:

Response.Redirect ". /test.asp "
Header ("Location:.. /test.php ");

The difference between the two:

The redirect function of an ASP can work after sending a header file to the customer.
Such as

 
  
  

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

Check that the following code in PHP will report an error:

 
 

  
  

  
<   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 >  
 
 

It is not possible to send any data to the client before the PHP header.
Example 2:

in ASP

 
 

  
  

  
<   html> <  head><  /head  > <  body > 
  
  

  
< % 
  
  

  
Response.Redirect ". /a.asp "
  
  

  
Response.Redirect ". /b.asp "
  
  

  
% >  
  
  

  
< /body > < /html >  
  
  

  
The result is a redirected a.asp file.
  
  

  
What about PHP?
  
  

  
<  ? 
  
  

  
Header ("Location:.. /a.php ");
  
  

  
Header ("Location:.. /b.php ");
  
  

  
?>  
  
  

  
<   html> <  head>< /head > <   body><  /body><  / HTML>  
 
 

We found it redirected b.php.
The subsequent code is no longer executed after executing redirect in ASP.
PHP continues to execute the following code after the header is executed.
In this regard, header redirection in PHP is not as good as redirection in ASP. Sometimes after we redirect, we cannot execute the following code:
Generally, we use

 
  
  

  
   
   
if (...) 
  
   
   
Header ("..."); 
  
   
   
Else 
  
   
   
{ 
  
   
   
... 
  
   
   
} 
 
  
  

But we can simply use the following PHP header method:

 
  
  

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

Also note that if there is a problem with Unicode (UTF-8) encoding, you need to adjust the cache settings for the PHP header.

 
 

  
  

  
< [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 > 
 
 

These are some of the issues that you should be aware of when using PHP headers.

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