PHP to obtain the http request header information

PHP to obtain the http request header information. The PHP Manual provides ready-made Functions: getallheaders (PHP4, PHP5) getallheaders-FetchallHTTPrequestheaders description arraygetallheaders (void) FetchesallHTTPheadersfrom PHP Manual provides ready-made functions:
Getallheaders
(PHP 4, PHP 5)
Getallheaders-Fetch all HTTP request headers
Description
Array getallheaders (void)
Fetches all HTTP headers from the current request.
This function is an alias for apache_request_headers (). Please read theapache_request_headers () documentation for more information on how this function works.
Return value
An associative array of all the HTTP headers in the current request, orFALSE on failure.
Example #1 getallheaders () example

  $value) { echo "$name: $value\n"; } ?>

However, this function can only be used in an apache environment. iis or nginx does not support this function. it can be implemented through a custom function.

  $value)        {            if (substr($name, 0, 5) == 'HTTP_')            {                $headers[str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))))] = $value;            }        }        return $headers;     } } ?>

Okay. let's see what's printed.

 
Result:
Array ( [Accept] => */* [Accept-Language] => zh-cn [Accept-Encoding] => gzip, deflate [User-Agent] => Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727) [Host] => localhost [Connection] => Keep-Alive )
Related articles:
Php methods for retrieving http request header information
Php HTTP request class, supporting GET, POST, Multipart/form-data
Example of http request encapsulation implemented by php