PHP function header () query a single part of the specific method of parsing _php tutorial

How do we use the specific content we are explaining to you today?Here is a script called calling.php:

 
 

  
  

  

  
  

  
"-//W3C//DTD HTML 4.0 transitional//en"
  
  

  
"Http://www.w3.org/TR/html4/loose.dtd"  > 
  
  

  
< HTML > 
  
  

  
< Head > 
  
  

  
< title >  Calling page Example   title>  
  
  

  
 Head > 
  
  

  
< Body > 
  
  

  
< a    href="action.php">clickhere!   a>  
  
  

  
 Body > 
  
  

  
 HTML > 
 
 

When the user clicks on the connection above, the PHP function header () goes to call action.php. Here is the source code for action.php:

 
  
  

  
   
   
 Php 
  
   
   
Database Features 
  
   
   

  
   
   
redirect 
  
   
   
Header ("Location: $HTTP _referer"); 
  
   
   
Exit 
  
   
   
?> 
 
  
  

Here are two common mistakes to remind:

Call the PHP function header () to include an exit statement to stop the script, or the subsequent script may be output before the header is sent.

A common error with the header () function is:

Warning:cannot Add header information-headers already sent ...

The PHP function header () can only be called before the HTML output, so you need to check for empty lines, spaces, and so on that may exist before PHP.

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