facebook中的facebook链接

Question

I am trying to extract the PHP of links generated in a facebook RSS feed, and make it into simple html once clicked. the links look like this:

http://l.facebook.com/l.php?u=http%3A%2F%2Fwww.theguardian.com%2Ftravel%2F2014%2Fapr%2F25%2Fitaly-puglia-salento-region&h=2AQF4oNrg&s=1

this is the original link:

http://www.theguardian.com/travel/2014/apr/25/italy-puglia-salento-region

I am using this code but seems to be an error on line 2.

$matches = array();
pregmatchall(/http:\/\/l\.facebook\.com\/l\.php\?u=([^"]+)/, $rss, $matches);

foreach($matches[0] as $index => $match) {
    $url = urldecode(html_entity_decode($matches[1][$index]));
    str_replace($match, $url, $rss);
}

Answer 1

Try this

$matches = array();
$rss="http://l.facebook.com/l.php?u=http%3A%2F%2Fwww.theguardian.com%2Ftravel%2F2014%2Fapr%2F25%2Fitaly-puglia-salento-region&h=2AQF4oNrg&s=1";
preg_match_all('/http:\/\/l\.facebook\.com\/l\.php\?u=([^"]+)/', $rss, $matches);

foreach($matches[0] as $index => $match) {
    $url = urldecode(html_entity_decode($matches[1][$index]));
    str_replace($match, $url, $rss);
}

echo $url;