Simple Server List API

serverlist.php

<?php

$mckey = "rcs";

$memcache = new Memcache;
$memcache->addServer("localhost");
$server = $memcache->get($mckey);
if($server == false){
        $server = new stdClass();
        $server->list = array();
}
$server->time = time();

$timeout = 10;
$max_connections = 100;

$server_change = false;
$attempt_validate = true;
$result=null;
$error=null;

foreach($server->list as $connection_key => $connection){
        if(time()-$connection->time > $timeout){
                unset($server->list[$connection_key]);
                $server_change = true;
        }
}
if(count($server->list) >= $max_connections){
        $attempt_validate = false;
        $error = "Server has reached max connections";
}

$connection = new stdClass();

$input = $_GET;
if(isset($_GET['i'])){
        // decode json with assoc tables
        $data = json_decode($_GET['i'],true);
        if($data !== null){
                $input = $data;
        }
}
if(isset($input['name'])){
        $connection->name = $input['name'];
} else {
        $attempt_validate = false;
}
$connection->ip = $_SERVER['REMOTE_ADDR'];
if(isset($input['port'])){
        $connection->port = intval($input['port']);
} else {
        $attempt_validate = false;
}
if(isset($input['started'])){
        $connection->started = filter_var($input['started'], FILTER_VALIDATE_BOOLEAN);
} else {
        $attempt_validate = false;
}
if(isset($input['players'])){
        $connection->players = intval($input['players']);
} else {
        $attempt_validate = false;
}
if(isset($input['owner'])){
        $connection->owner = $input['owner'];
} else {
        $attempt_validate = false;
}
$connection->time = time();

function valid_connection($connection){
        if(strlen($connection->name)==0){
                return "Connection name must be greater than zero characters";
        }
        if(!filter_var($connection->ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)){
                return "Connection ip must be valid IPv4 address";
        }
        if($connection->port < 1 or $connection->port > 65535){
                return "Connection port must be valid port";
        }
        if(strlen($connection->owner)==0){
                return "Connection owner must be greater than zero characters";
        }
        return true;
}

if($attempt_validate){
        $result = valid_connection($connection);
        if($result === true){
                foreach($server->list as $scon_key => $scon){
                        if($connection->owner == $scon->owner){
                                unset($server->list[$scon_key]);
                        }
                }
                $server->list[] = $connection;
                $server_change = true;
        }
}
if($server_change){
        $server->list = array_values($server->list);
        $memcache->set($mckey,$server,MEMCACHE_COMPRESSED,0);
}
if($result !== null and $result !== true){
        $server->error = $result;
} elseif($error) {
        $server->error = $error;
}

header('Content-Type: application/json');
echo json_encode($server,true);