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PHP function header () specific method for querying a single part parsing _ PHP Tutorial

Source: Internet
Author: User
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The PHP function header () is used to parse a single part. The following is a script called calling. php :! DOCTYPEHTMLPUBLIC-W3CDTDHTML4.0TransitionalENwww.w3.org today we explain how to use the specific contentThe following is a script called calling. php: 

 
 
    
  
  
  1. 
  
  
  2. "-//W3C//DTD HTML 4.0 Transitional//EN" 
    3. 
  
  
  3. "http://www.w3.org/TR/html4/loose.dtd" > 
    4. 
  
  
  4. <html> 
    5. 
  
  
  5. <head> 
    6. 
  
  
  6. <title>Calling page example title> 
    7. 
  
  
  7.  head> 
    8. 
  
  
  8. <body> 
    9. 
  
  
  9. <a href="action.php">Click here! a> 
    10. 
  
  
  10.  body> 
    11. 
  
  
  11.  html> 
    12.

When the user clicks the connection above, the PHP function header () will call action. php. The following is the source code of action. php:

 
 
    
  
  
  1.  Php 
    2. 
  
  
  2. // Database functions
    3. 
  
  
  3.  
    4. 
  
  
  4. // Redirect
    5. 
  
  
  5. Header ("Location: $ HTTP_REFERER ");
    6. 
  
  
  6. Exit;
    7. 
  
  
  7. ?> 
    8.

There are two common errors to be reminded:

After the PHP function header () is called, an exit statement must be included to stop the script. otherwise, subsequent scripts may be output before the header is sent.

A common error in the header () function is:

Warning: Cannot add header information-headers already sent...

The PHP function header () can only be called before HTML output. Therefore, you need to check possible empty lines and spaces before php.


The following is a script called calling. php :! DOCTYPEHTMLPUBLIC "-// W3C // DTDHTML4.0Transitional //" http://www.w3.org /...

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Related Keywords:
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