用PHP或JS扩展缩短的URL(例如Bitly，Tinyurl)以查找原始URL的最佳方法是什么? [英] What is the best way in PHP or JS to expand shortened URLs like Bitly, Tinyurl to find the original URL?

问题描述

我正在使用Twitter和Facewbook API使用类似于bit.ly或TinyURL的服务提取可能包含缩短的URL的帖子.我需要进行实时扩展以获取原始URL，然后将内容从该URL提取到我的应用中.

I am using the Twitter and Facewbook API to pull posts that potentially contain shortened URLs using bit.ly or TinyURL like services. I need to do a real-time expansion to get the original URL then pull content from that URL into my app.

推荐答案

您可以使用CURL扩展短网址.

You can use CURL to expand a short URL.

尝试一下:

    function traceUrl($url, $hops = 0)
    {
        if ($hops == MAX_URL_HOPS)
        {
            throw new Exception('TOO_MANY_HOPS');
        }

        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_HEADER, 1);
        curl_setopt($ch, CURLOPT_NOBODY, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
        $r = curl_exec($ch);

        if (preg_match('/Location: (?P<url>.*)/i', $r, $match))
        {
            return traceUrl($match['url'], $hops + 1);
        }

        return rtrim($url);
    }

您可以按以下方式使用此函数: traceUrl('http://bit.ly/example').从某种意义上说，此功能是递归的，甚至可以找到缩短的短网址(如果曾经发生过).确保设置 MAX_URL_HOPS 常量.我使用 define('MAX_URL_HOPS'，5); .

You can use this function as so traceUrl('http://bit.ly/example'). This function is recursive in the sense that it will even find short urls that are shortened (if it ever happens). Make sure you set the MAX_URL_HOPS constant. I use define('MAX_URL_HOPS', 5);.

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