Get final URL from double shortened URL (t.co & # 8594; bit.ly & # 8594; final)
I was not able to convert the double shortened url to expanded url successfully using the following function I got from here :
function doShortURLDecode($url) {
$ch = @curl_init($url);
@curl_setopt($ch, CURLOPT_HEADER, TRUE);
@curl_setopt($ch, CURLOPT_NOBODY, TRUE);
@curl_setopt($ch, CURLOPT_FOLLOWLOCATION, FALSE);
@curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$response = @curl_exec($ch);
preg_match('/Location: (.*)\n/', $response, $a);
if (!isset($a[1])) return $url;
return $a[1];
}
I was having problems where the expanded url I received was again a shortened url that has an expanded url.
How do I get the final extended URL after it has been launched through URL shortening services?
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Finally found a way to get the final url of the double shortened url. The best way is to use the longurl api for it.
I'm not sure if this is the correct way, but I finally get the output as the final url :)
Here's what I did:
<?php
function TextAfterTag($input, $tag)
{
$result = '';
$tagPos = strpos($input, $tag);
if (!($tagPos === false))
{
$length = strlen($input);
$substrLength = $length - $tagPos + 1;
$result = substr($input, $tagPos + 1, $substrLength);
}
return trim($result);
}
function expandUrlLongApi($url)
{
$format = 'json';
$api_query = "http://api.longurl.org/v2/expand?" .
"url={$url}&response-code=1&format={$format}";
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $api_query );
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 0);
curl_setopt($ch, CURLOPT_HEADER, false);
$fileContents = curl_exec($ch);
curl_close($ch);
$s1=str_replace("{"," ","$fileContents");
$s2=str_replace("}"," ","$s1");
$s2=trim($s2);
$s3=array();
$s3=explode(",",$s2);
$s4=TextAfterTag($s3[0],(':'));
$s4=stripslashes($s4);
return $s4;
}
echo expandUrlLongApi('http://t.co/dd4b3kOz');
?>
The output I get is:
"http://changeordie.therepublik.net/?p=371#proliferation"
The above code works.
The code @cryptic shared is also correct , but I was not able to get the result on my server (possibly due to some configuration issue).
If anyone thinks this could be done in some other way, please feel free to share it.
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Since it t.co
uses HTML redirection using JavaScript redirects and / or <meta>
, we need to transfer its content first. Then extract the URL from it bit.ly
to make a request for the HTTP header to get the final location. This method does not rely on server side cURL enablement and uses all native PHP5 functions:
Tested and working!
function large_url($url)
{
$data = file_get_contents($url); // t.co uses HTML redirection
$url = strtok(strstr($data, 'http://bit.ly/'), '"'); // grab bit.ly URL
stream_context_set_default(array('http' => array('method' => 'HEAD')));
$headers = get_headers($url, 1); // get HTTP headers
return (isset($headers['Location'])) // check if Location header set
? $headers['Location'] // return Location header value
: $url; // return bit.ly URL instead
}
// DEMO
$url = 'http://t.co/dd4b3kOz';
echo large_url($url);
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In case the problem is not Javascript redirect like in t.co it is stackexchange url redistribution like https://stackoverflow.com/q/62317
fine:
public function doShortURLDecode($url) {
$ch = @curl_init($url);
@curl_setopt($ch, CURLOPT_HEADER, TRUE);
@curl_setopt($ch, CURLOPT_NOBODY, TRUE);
@curl_setopt($ch, CURLOPT_FOLLOWLOCATION, FALSE);
@curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$response = @curl_exec($ch);
$cleanresponse= preg_replace('/[^A-Za-z0-9\- _,.:\n\/]/', '', $response);
preg_match('/Location: (.*)[\n\r]/', $cleanresponse, $a);
if (!isset($a[1])) return $url;
return parse_url($url, PHP_URL_SCHEME).'://'.parse_url($url, PHP_URL_HOST).$a[1];
}
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