Behind the bit.ly url

By John Swindells 08 Jul 2010 | Comment
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If you want to know more about what a bit.ly url refers to, here is a PHP function that may be of use to you. It first checks what the destination URL is, and what the title is. Unfortunately this requires two different bit.ly API calls.

Note:

  • You can ask for 15 different URLs in each call, if you have a bunch that you need to analyse.
  • The URL returned is not necessarily the 'final' one, and may still need to be checked (by a separate HTTP request) for a Location: response in its header.
function bitly($url,&$title) { $login="mylogin"; $apikey="my-api-key"; $bitlyurl="http://api.bit.ly/v3/expand?shortUrl=".urlencode($url)."&login=$login&apiKey=$apikey&format=json"; $inf=json_decode(simpleget($bitlyurl),true); $code=$inf["status_code"]; if($code != 200) { print "bitly($url) Error code $code\n"; return; } $ret=$inf["data"]["expand"][0]["long_url"]; $bitlyurl="http://api.bit.ly/v3/info?shortUrl=".urlencode($url)."&login=$login&apiKey=$apikey&format=json"; $inf=json_decode(simpleget($bitlyurl),true); $code=$inf["status_code"]; if($code != 200) { print "bitly($url) Error code $code\n"; return; } $title=$inf["data"]["info"][0]["title"]; print "bitly($url) title=$title ; url=$ret\n"; return $ret; } function simpleget($url) { $ch=curl_init($url); curl_setopt($ch, CURLOPT_TIMEOUT, 6); curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 3); curl_setopt($ch, CURLOPT_USERAGENT, "simpleget"); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); return curl_exec($ch); }

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