<?php
/*
* Author: James Hinds
* The author makes no claims regarding copyrights. Do with it what you will.
*
* Problem: Where do those tinyurl's really point to?
*
* This class will follow the 'Location:' headers and return the last one
* from the HTTP responses as they comes through.
*
* The body of the final HTML site is not accessed to avoid useless data transfers.
*
* For more info on CURLOPT_HEADERFUNCTION and CURLOPT_WRITEFUNCTION see:
* <http://curl.haxx.se/libcurl/c/curl_setopt.html>
* */
class untiny {
var $location;
var $errorMsg;
// requires libcurl support for PHP (Rev level 7.7.2 or above)
function read_header($ch, $string)
{
//libcurl must see the exact length of the untrimmed input string
$length = strlen($string);
// but we dont want any trailing \r \n or other stuff
$string=trim($string);
if( preg_match('/Location:(.*)/',$string,$dummy)) {
$this->location = trim($dummy[1]);
}
//echo "Header: $string\n";
return $length;
}
function resolveError () {
return $this->errorMsg;
}
function untiny_url($url) {
// pass in the url to resolve, we return the final destination or false
$this->location = $url;
$this->errorMsg = "";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION,1);
curl_setopt($ch, CURLOPT_NOBODY,1);
//Set callback function for headers
curl_setopt($ch, CURLOPT_HEADERFUNCTION, array($this, 'read_header'));
curl_exec($ch);
$this->errorMsg = curl_error($ch);
// Do not re-use the curl channel
curl_close($ch);
return $this->errorMsg?false:$this->location;
}
}
$test_me=true;
if ( $test_me ) {
$resolve = new untiny();
if ( $final = $resolve->untiny_url('http://tinyurl.com/cm6kcz')) {
echo("Resolves to $final\n");
}
if ( $final = $resolve->untiny_url('http://romancecapitol.com/')) {
echo("Resolves to $final\n");
}
if ( $final = $resolve->untiny_url('http://www.romancecapitol.com/')) {
echo("Resolves to $final\n");
}
}
?>
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