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Editing: OAuthUtil.php

<?php
/*!
* This file is part of the OAuth PHP Library (https://code.google.com/p/oauth/)
*
* OAuth `PHP' Library is an open source software available under the MIT License.
*/

namespace Hybridauth\Thirdparty\OAuth;

/**
 * Class OAuthUtil
 *
 * @package Hybridauth\Thirdparty\OAuth
 */
class OAuthUtil
{
    /**
     * @param $input
     *
     * @return array|mixed|string
     */
    public static function urlencode_rfc3986($input)
    {
        if (is_array($input)) {
            return array_map(array(
                '\Hybridauth\Thirdparty\OAuth\OAuthUtil',
                'urlencode_rfc3986'
            ), $input);
        } elseif (is_scalar($input)) {
            return str_replace('+', ' ', str_replace('%7E', '~', rawurlencode($input)));
        } else {
            return '';
        }
    }
    
    // This decode function isn't taking into consideration the above
    // modifications to the encoding process. However, this method doesn't
    // seem to be used anywhere so leaving it as is.
    /**
     * @param $string
     *
     * @return string
     */
    public static function urldecode_rfc3986($string)
    {
        return urldecode($string);
    }
    
    // Utility function for turning the Authorization: header into
    // parameters, has to do some unescaping
    // Can filter out any non-oauth parameters if needed (default behaviour)
    // May 28th, 2010 - method updated to tjerk.meesters for a speed improvement.
    // see http://code.google.com/p/oauth/issues/detail?id=163
    /**
     * @param      $header
     * @param bool $only_allow_oauth_parameters
     *
     * @return array
     */
    public static function split_header($header, $only_allow_oauth_parameters = true)
    {
        $params = array();
        if (preg_match_all('/(' . ($only_allow_oauth_parameters ? 'oauth_' : '') . '[a-z_-]*)=(:?"([^"]*)"|([^,]*))/', $header, $matches)) {
            foreach ($matches[1] as $i => $h) {
                $params[$h] = OAuthUtil::urldecode_rfc3986(empty($matches[3][$i]) ? $matches[4][$i] : $matches[3][$i]);
            }
            if (isset($params['realm'])) {
                unset($params['realm']);
            }
        }
        return $params;
    }
    
    // helper to try to sort out headers for people who aren't running apache

/**
     * @return array
     */
    public static function get_headers()
    {
        if (function_exists('apache_request_headers')) {
            // we need this to get the actual Authorization: header
            // because apache tends to tell us it doesn't exist
            $headers = apache_request_headers();
            
            // sanitize the output of apache_request_headers because
            // we always want the keys to be Cased-Like-This and arh()
            // returns the headers in the same case as they are in the
            // request
            $out = array();
            foreach ($headers as $key => $value) {
                $key       = str_replace(" ", "-", ucwords(strtolower(str_replace("-", " ", $key))));
                $out[$key] = $value;
            }
        } else {
            // otherwise we don't have apache and are just going to have to hope
            // that $_SERVER actually contains what we need
            $out = array();
            if (isset($_SERVER['CONTENT_TYPE'])) {
                $out['Content-Type'] = $_SERVER['CONTENT_TYPE'];
            }
            if (isset($_ENV['CONTENT_TYPE'])) {
                $out['Content-Type'] = $_ENV['CONTENT_TYPE'];
            }
            
            foreach ($_SERVER as $key => $value) {
                if (substr($key, 0, 5) == "HTTP_") {
                    // this is chaos, basically it is just there to capitalize the first
                    // letter of every word that is not an initial HTTP and strip HTTP
                    // code from przemek
                    $key       = str_replace(" ", "-", ucwords(strtolower(str_replace("_", " ", substr($key, 5)))));
                    $out[$key] = $value;
                }
            }
        }
        return $out;
    }

// This function takes a input like a=b&a=c&d=e and returns the parsed
    // parameters like this
    // array('a' => array('b','c'), 'd' => 'e')
    /**
     * @param $input
     *
     * @return array
     */
    public static function parse_parameters($input)
    {
        if (!isset($input) || !$input) {
            return array();
        }
        
        $pairs = explode('&', $input);
        
        $parsed_parameters = array();
        foreach ($pairs as $pair) {
            $split     = explode('=', $pair, 2);
            $parameter = OAuthUtil::urldecode_rfc3986($split[0]);
            $value     = isset($split[1]) ? OAuthUtil::urldecode_rfc3986($split[1]) : '';
            
            if (isset($parsed_parameters[$parameter])) {
                // We have already recieved parameter(s) with this name, so add to the list
                // of parameters with this name
                
                if (is_scalar($parsed_parameters[$parameter])) {
                    // This is the first duplicate, so transform scalar (string) into an array
                    // so we can add the duplicates
                    $parsed_parameters[$parameter] = array(
                        $parsed_parameters[$parameter]
                    );
                }
                
                $parsed_parameters[$parameter][] = $value;
            } else {
                $parsed_parameters[$parameter] = $value;
            }
        }
        return $parsed_parameters;
    }

/**
     * @param $params
     *
     * @return string
     */
    public static function build_http_query($params)
    {
        if (!$params) {
            return '';
        }
        
        // Urlencode both keys and values
        $keys   = OAuthUtil::urlencode_rfc3986(array_keys($params));
        $values = OAuthUtil::urlencode_rfc3986(array_values($params));
        $params = array_combine($keys, $values);
        
        // Parameters are sorted by name, using lexicographical byte value ordering.
        // Ref: Spec: 9.1.1 (1)
        uksort($params, 'strcmp');
        
        $pairs = array();
        foreach ($params as $parameter => $value) {
            if (is_array($value)) {
                // If two or more parameters share the same name, they are sorted by their value
                // Ref: Spec: 9.1.1 (1)
                // June 12th, 2010 - changed to sort because of issue 164 by hidetaka
                sort($value, SORT_STRING);
                foreach ($value as $duplicate_value) {
                    $pairs[] = $parameter . '=' . $duplicate_value;
                }
            } else {
                $pairs[] = $parameter . '=' . $value;
            }
        }
        // For each parameter, the name is separated from the corresponding value by an '=' character (ASCII code 61)
        // Each name-value pair is separated by an '&' character (ASCII code 38)
        return implode('&', $pairs);
    }
}