Simple clone of StumbleUpon

Stumblr.php

<?php

# javascript:window.location = "<LINK TO FILE>?u="+encodeURIComponent(window.location);

require 'rb.php';

function linkExists($url) {
    $links = R::findAll('link', '1');

    foreach ($links as $link) {
        if ($link->url == $url) {
            return true;
        }
    }

    return false;
}

R::setup('sqlite:db.txt');

if (isset($_GET['u']) && !linkExists($_GET['u']) && @fopen($_GET['u'], 'r')) {
    $link = R::dispense('link');
    $link->url = urldecode($_GET['u']);

    R::store($link);

    echo "Link submitted successfully";
} else {
    $links = R::$f->begin()->select('id')->from('link')->get('col');
    $link = R::load('link', array_rand($links));

    header('Location: ' . $link->url);
}