How to get the header information of http request in php

 foreach (getallheaders() as $name => $value) {
 echo "$name: $valuen";
 }
?>

However, this function can only be used in the apache environment. It is not supported by iis or nginx. It can be implemented through a custom function.

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

and check it Output the results.

print_r(getallheaders());
?>

to get the 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 )