getallheaders

it could be useful if you using nginx instead of apache

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

There's a polyfill for this that can be downloaded or installed via composer:https://github.com/ralouphie/getallheaders

A simple approach to dealing with case insenstive headers (as per RFC2616) is via the built in array_change_key_case() function: $headers = array_change_key_case(getallheaders(), CASE_LOWER);

Beware that RFC2616 (HTTP/1.1) defines header fields as case-insensitive entities. Therefore, array keys of getallheaders() should be converted first to lower- or uppercase and processed such.

dont forget to add the content_type and content_lenght if your are uploading file:

<?php
  function emu_getallheaders() {
        foreach ($_SERVER as $name => $value) 
       {
           if (substr($name, 0, 5) == 'HTTP_') 
           {
               $name = str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))));
               $headers[$name] = $value;
           } else if ($name == "CONTENT_TYPE") {
               $headers["Content-Type"] = $value;
           } else if ($name == "CONTENT_LENGTH") {
               $headers["Content-Length"] = $value;
           } 
       }
       return $headers;
    }
?>

chears magno c. heck

if you want a specific header,<?phpfunction get_response_header(string $header_name = 'Content-Type', bool $trim = true): ?string{    $header_name .= ':';    $list = headers_list();    $len = strlen($header_name);    foreach ($list as $header) {        if (strncasecmp($header, $header_name, $len) === 0) {            $ret = substr($header, $len);            if ($trim) {                $ret = trim($ret);            }            return $ret;        }    }    return null;}?>

apache_request_headers replicement for nginx

<?php
if (!function_exists('apache_request_headers')) { 
        function apache_request_headers() { 
            foreach($_SERVER as $key=>$value) { 
                if (substr($key,0,5)=="HTTP_") { 
                    $key=str_replace(" ","-",ucwords(strtolower(str_replace("_"," ",substr($key,5))))); 
                    $out[$key]=$value; 
                }else{
                    $out[$key]=$value; 
        }
            } 
            return $out; 
        } 
}
?>

warning, at least on php-fpm 8.2.1 and nginx,  getallheaders() will return "Content-Length" and "Content-Type" both containing emptystring, even for requests without any of these 2 headers. you can do something like<?php$request_headers = getallheaders();if(($request_headers["Content-Type"] ?? null) === "" && ($request_headers["Content-Length"] ?? null) === "") {    // probably a getallheaders() bug, not actual request headers.    unset($request_headers["Content-Type"], $request_headers["Content-Length"]);}?>- might be a bug in nginx rather than php-fpm, i don't know. anyway a real request wouldn't leave them at emptystring