Beh

<?php
    //Database connection info
    $db_hostname = "localhost"; //Hostname
    $db_port = 3306;        //Port
    $db_username = "";      //Username
    $db_password = "";  //Password
    $db_database = "";  //Database

    //Steam info
    $steam_username = "";   //Steam username
    $steam_password = "";   //Steam password
    $steam_communityid = "";
    $steam_cookie = "";

    //Plugin info
    $plugin_groupid = "";       //Community ID of the group
    $plugin_invites = "250";    //Number of invites per day

    //Getting plugin info
    if(!file_exists("autoinvite.txt"))
    {
        touch("autoinvite.txt");
        $invites_sofar = 0;
        $time_of_last_max = 0;
    }
    else
    {
        list($invites_sofar, $steam_cookie, $time_of_first) = explode("\n", file_get_contents("autoinvite.txt"));
    }

    //Over the time limit, resetting
    if($time_of_first < (time()-7200))
        {
        $invites_sofar = 0;

        //Fetching Steam cookie
            $data = array("username" => $steam_username,
                "password" => $steam_password,
                "emailauth" => "",
                        "captchagid" => "-1",
                        "captcha_text" => "");
            $steam_login = curl_init();
            curl_setopt($steam_login, CURLOPT_URL, "https://steamcommunity.com/login/dologin/");
            curl_setopt($steam_login, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($steam_login, CURLOPT_HEADER, 1);
            curl_setopt($steam_login, CURLOPT_POST, 1);
            curl_setopt($steam_login, CURLOPT_POSTFIELDS, $data);
                $output=curl_exec($steam_login);
            if(preg_match("/steamLogin=(.*);/i", $output, $steam_cookie))
                $steam_cookie = $steam_cookie[1];
            curl_close($steam_login);
        }

    $steam_communityid = strstr($steam_cookie, "%", true);

    //Connect to database
    $mysqli_conn = new mysqli($db_hostname, $db_username, $db_password, $db_database, $db_port);

    $invites_now = 0;

    if($invites_sofar < $plugin_invites)
    {
        if(isset($_GET["communityid"]))
        {
                        $result = invite_player($steam_communityid, $_GET["communityid"], $plugin_groupid, $steam_cookie);
            if(preg_match("/\<\!\[CDATA\[OK\]\]\>/", $result))
                        {
                $invites_now++;
                                $mysqli_conn->query("INSERT INTO invited_players (communityid) VALUES(\"".$mysqli_conn->real_escape_string($_GET["communityid"])."\")");
                        }
                        if($_GET["log"])
                        {
                                echo $result;
                        }
        }

                if(($invites_sofar + $invites_now) < $plugin_invites)
        {
            //Fetch queued players and invite them

            $successful_invites = array();

            $mysql_query = $mysqli_conn->query("SELECT * FROM queued_players LIMIT 0, ".($plugin_invites-$invites_sofar-$invites_now));

            while($player = $mysql_query->fetch_assoc())
            {
                $result = invite_player($steam_communityid, $player["communityid"], $plugin_groupid, $steam_cookie);

                if(preg_match("/\<\!\[CDATA\[OK\]\]\>/", $result))
                {
                     $invites_now++;
                                     $mysqli_conn->query("INSERT INTO invited_players (communityid) VALUES(\"".$player["communityid"]."\")");
                                }
                                $successful_invites[] = $player["communityid"];
            }

            //Delete successfully invited players from database

            $mysql_query_string = "DELETE FROM queued_players WHERE";

            for($i=0;$i<count($successful_invites);++$i)
            {
                $mysql_query_string .= " communityid=\"".$successful_invites[$i]."\"";
                if(($i+1) != count($successful_invites))
                    $mysql_query_string .= " OR";
            }

            $mysqli_conn->query($mysql_query_string);
        }
    }
    else
    {
        if(isset($_GET["communityid"]))
        {
            //Can't invite more today, queueing
            $mysqli_conn->query("INSERT INTO queued_players (communityid) VALUES(\"".$mysqli_conn->real_escape_string($_GET["communityid"])."\")");
        }
    }

    //Close database connection
    $mysqli_conn->close();

    //Saving plugin info
        //New session
    if($invites_sofar == 0)
                $time_of_first = time();

    $invites_sofar += $invites_now;

    file_put_contents("autoinvite.txt", $invites_sofar."\n".$steam_cookie."\n".$time_of_first);

    function invite_player($inviter, $invitee, $group, $steam_cookie)
    {
        $query_string = "?type=groupInvite&inviter=".$inviter."&invitee=".$invitee."&group=".$group;
        $steam_invite = curl_init();
        curl_setopt($steam_invite, CURLOPT_URL, "http://steamcommunity.com/actions/GroupInvite".$query_string);
        curl_setopt($steam_invite, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($steam_invite, CURLOPT_HEADER, 1);
        curl_setopt($steam_invite, CURLOPT_COOKIE, "steamLogin=".$steam_cookie);
        $result = curl_exec($steam_invite);
        curl_close($steam_invite);
        return $result;
    }
?>