PHP gets HTTP header information and methods to get HTTP header information in CI

How to get HTTP header information in CI:

$this->input->request_headers ()

is useful in non-Apache environments that do not support apache_request_headers (). Returns an array of header (header) requests.

$headers = $this->input->request_headers();

----------------------------------------------------------------------------------------------

Gets the header information for the HTTP request.

The PHP manual provides ready-made functions:

Getallheaders

(PHP 4, PHP 5)

getallheaders- Fetch All HTTP request Headers

Descriptionarray getallheaders ( void)

Fetches all HTTP headers from the current request.

This function is a alias for Apache_request_headers (). Please read theapache_request_headers () documentation For more information in how this function works.

return value

An associative array of any the HTTP headers in the current request, orFALSE on failure.

Example #1 getallheaders () Example

[PHP]View Plaincopy

1. <?php
3. foreach (getallheaders () as $name = = $value) {
4. echo "$name: $value \ n";
5. }
7. ?>

However, this function can only be used in Apache environment, IIS or Nginx is not supported, can be implemented by custom functions

[PHP]View Plaincopy

2. <?php
4. <span class="html" >if (!function_exists (' getallheaders '))
6. {
8. function getallheaders ()
10. {
12. foreach ($_server as $name = $value)
14. {
16. if (substr ($name, 0, 5) = = ' http_ ')
18. {
20. $headers [str_replace (', ' -'), Ucwords (strtolower (str_replace (' _ '), ',  substr ($name, 5))))] = $value;
22. }
24. }
26. return $headers;
28. }
30. }</span>
32. ?>

All right, let's see what's printed out.

[PHP]View Plaincopy

1. <?php
2. Print_r (getallheaders ());

Get results:

[HTML]View Plaincopy

1. ARRAY&NBSP;&NBSP;
2. (  
3. > */*  
4.      [accept-language] => zh-cn  
5. > gzip, deflate  
6.     [user-agent] => mozilla/4.0  ( compatible; msie 7.0; windows nt 5.1; trident/4.0; .net clr  2.0.50727)   
7.     [host] =>  localhost  
8.     [connection] =>  keep-alive  

PHP gets HTTP header information and how to get HTTP header information in CI