PHP URL Resolve HTTP Redirection Recursively

guzzle_v6_resolve_http_redirection.php

<?php 
/*
 * Resolver using Guzzle 
 */

if (!function_exists('resolve_http_redirection')) {
    /**
     * @param string $url
     * @param int $limit
     * @return mixed
     */
    function resolve_http_redirection($url, $limit = 10)
    {
        $location = null;

        $client = new \GuzzleHttp\Client([
            'on_stats' => function (\GuzzleHttp\TransferStats $stats) use (&$location) {
                $location = $stats->getEffectiveUri()->__toString() ?: $location;
            },
            'verify' => false,
            'headers' => [
                'User-Agent' => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36'
            ],
            'allow_redirects' => [
                'max' => $limit,
            ],
            'http_errors' => false,
            'cookies' => new \GuzzleHttp\Cookie\CookieJar()
        ]);

        $client->head($url);

        return $location ?: $url;
    }
}

resolve_http_redirection.php

<?php 

if (!function_exists('resolve_http_redirection')) {
    /**
     * Resolve http redirections.
     * Note: the function http_build_url depends on module "pecl_http", see https://github.com/jakeasmith/http_build_url for compatibility
     * @param $url
     * @param int $limit Redirection Limit
     * @return string
     */
    function resolve_http_redirection($url, $limit = 10) {
        /**
         * Segments to fix when the header "Location" is just a path
         */
        static $urlSegmentsToFix= [
            'host',
            'scheme'
        ];

        static $headerLocationLength = 9;

        if ($limit < 1) {
            return $url;
        }

        $headers = @get_headers($url);

        if ($headers !== false) {
            foreach($headers as $header) {
                if (stripos($header, 'Location:') === 0) {
                    $location = parse_url(
                        trim(
                            substr($header, $headerLocationLength)
                        )
                    );

                    $parts = parse_url($url);

                    // Fix location port
                    if (!isset($location['scheme']) && !isset($location['port']) && isset($parts['port'])) {
                        $location['port'] = $parts['port'];
                    }

                    // Fix url segments (host, scheme ...)
                    foreach($urlSegmentsToFix as $segment) {
                        if(!isset($location[$segment]) && isset($parts[$segment])) {
                            $location[$segment] = $parts[$segment];
                        }
                    }

                    $url = http_build_url($location);
                    $limit = $limit - 1;

                    return resolve_http_redirection($url, $limit);
                }
            }
        }

        return $url;
    }
}