src/Debug/Utilities.php
public static function getAllHeaders()
    {
        if (\function_exists('getallheaders')) {
            return \getallheaders();
        }
        $headers = array();
        $copyServer = array(
            'CONTENT_TYPE'   => 'Content-Type',
            'CONTENT_LENGTH' => 'Content-Length',
            'CONTENT_MD5'    => 'Content-Md5',
        );
        foreach ($_SERVER as $key => $value) {
            if (\substr($key, 0, 5) === 'HTTP_') {
                $key = \substr($key, 5);
                if (!isset($copyServer[$key]) || !isset($_SERVER[$key])) {
                    $key = \str_replace(' ', '-', \ucwords(\strtolower(\str_replace('_', ' ', $key))));
                    $headers[$key] = $value;
                }
            } elseif (isset($copyServer[$key])) {
                $headers[$copyServer[$key]] = $value;
            }
        }
        if (!isset($headers['Authorization'])) {
            if (isset($_SERVER['REDIRECT_HTTP_AUTHORIZATION'])) {
                $headers['Authorization'] = $_SERVER['REDIRECT_HTTP_AUTHORIZATION'];
            } elseif (isset($_SERVER['PHP_AUTH_USER'])) {
                $basicPass = isset($_SERVER['PHP_AUTH_PW']) ? $_SERVER['PHP_AUTH_PW'] : '';
                $headers['Authorization'] = 'Basic ' . \base64_encode($_SERVER['PHP_AUTH_USER'] . ':' . $basicPass);
            } elseif (isset($_SERVER['PHP_AUTH_DIGEST'])) {
                $headers['Authorization'] = $_SERVER['PHP_AUTH_DIGEST'];
            }
        }
        return $headers;
    }
public static function getAllHeaders()
    {
        if (\function_exists('getallheaders')) {
            return \getallheaders();
        }
        $headers = array();
        $copyServer = array(
            'CONTENT_TYPE'   => 'Content-Type',
            'CONTENT_LENGTH' => 'Content-Length',
            'CONTENT_MD5'    => 'Content-Md5',
        );
        foreach ($_SERVER as $key => $value) {
            if (\substr($key, 0, 5) === 'HTTP_') {
                $key = \substr($key, 5);
                if (!isset($copyServer[$key]) || !isset($_SERVER[$key])) {
                    $key = \str_replace(' ', '-', \ucwords(\strtolower(\str_replace('_', ' ', $key))));
                    $headers[$key] = $value;
                }
            } elseif (isset($copyServer[$key])) {
                $headers[$copyServer[$key]] = $value;
            }
        }
        if (!isset($headers['Authorization'])) {
            if (isset($_SERVER['REDIRECT_HTTP_AUTHORIZATION'])) {
                $headers['Authorization'] = $_SERVER['REDIRECT_HTTP_AUTHORIZATION'];
            } elseif (isset($_SERVER['PHP_AUTH_USER'])) {
                $basicPass = isset($_SERVER['PHP_AUTH_PW']) ? $_SERVER['PHP_AUTH_PW'] : '';
                $headers['Authorization'] = 'Basic ' . \base64_encode($_SERVER['PHP_AUTH_USER'] . ':' . $basicPass);
            } elseif (isset($_SERVER['PHP_AUTH_DIGEST'])) {
                $headers['Authorization'] = $_SERVER['PHP_AUTH_DIGEST'];
            }
        }
        return $headers;
    }
Get all HTTP header key/values as an associative array for the current request.

@return string[string] The HTTP header key/value pairs.