connect('127.0.0.1', 6379);
function followLink($shortdb, $redis, $link){
$link = $shortdb->real_escape_string(strtolower(stripslashes(strip_tags($link))));
$link = str_replace('/', '', $link);
$sql = "SELECT * FROM `tracking` WHERE `id` = '$link' LIMIT 1;"; // Testing to see if the link has been visited before
if($result = $shortdb->query($sql)){
if($row = $result->fetch_assoc()){
$sql = "UPDATE `tracking` SET `clicks` = `clicks` + 1 WHERE `id` = '$link'"; // Yes it has, increment clicks by 1
if($result = $shortdb->query($sql)){
if($result->num_rows == 0){
die ($shortdb->error);
}
}
}
}else{
$sql = "INSERT INTO `tracking` (id, clicks) VALUES ('$link', 1)"; // No it hasn't, add 1 click to the table
if($result = $shortdb->query($sql)){
if($result->num_rows == 0){
die ($shortdb->error);
}
}
}
// Try to find it in the redis db first, if not there, add it
$short = $redis->get($link);
if (!$short || $short == null) {
$sql = "SELECT * FROM `links` WHERE `shortlink` = '$link' LIMIT 1;";
if($result = $shortdb->query($sql)){
if($row = $result->fetch_assoc()){
$llink = $row['link'];
$redis->set($link, $llink);
echo $llink;
//header("location:$link");
exit(5); // Stop script execution to save on resources
}
}
}else{
echo $short;
exit(5);
}
}
// exit codes:
/*
exit 0 - Good script
exit 5 - Link redirection
10x exit codes
exit 11 - Shortener Stats redirection
exit 12 - Shortener Resolver redirection
exit 13 - Shortener About redirection
*/
// This has been depreciated. Still here for backwards compatibility with existing links
if(!empty($_GET['l'])){
followLink($shortdb, $redis, $_GET['l']);
}
// New way to check for valid short links, two characters shorter than the if statement above
if(!empty($_GET)){
$key = key($_GET);
if($key == "stats"){ header("location:http://s.lob.li"); exit(11); }
if($key == "resolv"){ header("location:http://r.lob.li"); exit(12); }
if($key == "about"){ header("location:http://a.lob.li"); exit(13); }
followLink($shortdb, $redis, $key);
}
?>
lob.li - Objective Links