The PHP manual provides off-the-shelf functions: getallheaders (PHP 4, PHP 5) getallheaders — Fetch all HTTP request headers instructions 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. The return value An associative array of all the HTTP headers in the current request, orFALSE on failure. Example #1 getallheaders() example

<?php
foreach (getallheaders() as $name => $value) {
echo "$name: $value\n";
}
?>

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

<?php
<SPAN class=html>if (!function_exists('getallheaders'))
{
&nbsp;&nbsp;&nbsp; function getallheaders()
&nbsp;&nbsp;&nbsp; {
&nbsp;&nbsp; &nbsp; &nbsp; foreach ($_SERVER as $name => $value)
&nbsp;&nbsp; &nbsp; &nbsp; {
&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (substr($name, 0, 5) == 'HTTP_')
&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {
&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $headers[str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))))] = $value;
&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }
&nbsp;&nbsp; &nbsp; &nbsp; }
&nbsp;&nbsp; &nbsp; &nbsp; return $headers;
&nbsp;&nbsp;&nbsp; }
}</SPAN>
?>

Ok, so let’s see what we get

<?php
print_r(getallheaders());

Results obtained:

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
)