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resolve_url_2.php
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resolve_url_2.php
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<?php
/******************************************************************************
Copyright 2008-2010 Christopher L. Stafford
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
/** func:
resolve_url
desc:
uses php function to peek at headers of url,
following location redirects, until finding 'last' url
param:
url [string]
URL of where to start from
return:
[false]
internal function returned false, nothing to recover
[string]
final destination
require:
to do/notes:
add ghetto cache like parent version?
maybe add param to return whole location array, and not pop?
**/
function resolve_url($in_url)
{
//get some http data
$headers = @get_headers($in_url, true);
//print_r($headers);
if($headers === false){ return false; }
if( array_key_exists('Location', $headers) === false )
{
//no redirects happened, this IS the final
return $in_url;
}
// redirects happened
if( is_array($headers['Location']) )
{
//more then one, pop last.
$out_url = array_pop($headers['Location']);
}
else
{
//just one, copy it.
$out_url = $headers['Location'];
}
//throw away the rest
unset($headers);
//give back that last one
return $out_url;
}