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My current chat room maintains it's user list on the client side. I need to move it to the server side.

 

 

 

 
<?php
require_once("./dbcon.php");
 
//Start Array
$data = array();
// Get data to work with
                $current = htmlentities(strip_tags($_GET['current']), ENT_QUOTES);
                $room = htmlentities(strip_tags($_GET['room']), ENT_QUOTES);
                $username = htmlentities(strip_tags($_GET['username']), ENT_QUOTES);
                $now = time();
 
                $data['room'] = $room;
// INSERT your data (if is not already there)
                $findUser = "SELECT * FROM `chat_users_rooms` WHERE `username` = '$username' AND `room` ='$room' ";
 
                if(!hasData($findUser))
                                {
                                        $insertUser = "INSERT INTO `chat_users_rooms` (`id`, `username`, `room`, `mod_time`) VALUES ( NULL , '$username', '$room', '$now')";
                                        mysql_query($insertUser) or die(mysql_error());
                                }
                        $findUser2 = "SELECT * FROM `chat_users` WHERE `username` = '$username'";
                        if(!hasData($findUser2))
                                {
                                        $insertUser2 = "INSERT INTO `chat_users` (`id` ,`username` , `status` ,`time_mod`)
                                        VALUES (NULL , '$username', '0', '$now')";
                                        mysql_query($insertUser2);
                                        //$data['check'] = 'true';
                                }
                $finish = time() + 1;
                $getRoomUsers = mysql_query("SELECT * FROM `chat_users_rooms` WHERE `room` = '$room'");
                $check = mysql_num_rows($getRoomUsers);
 
            while(true)
                {
                        usleep(10000);
                        mysql_query("UPDATE `chat_users` SET `time_mod` = '$now' WHERE `username` = '$username'");
                        $olduser = time() - 5;
                        $eraseuser = time() - 30;
                        mysql_query("DELETE FROM `chat_users_rooms` WHERE `mod_time` <  '$olduser'");
                        mysql_query("DELETE FROM `chat_users` WHERE `time_mod` <  '$eraseuser'");
                        $check = mysql_num_rows(mysql_query("SELECT * FROM `chat_users_rooms` WHERE `room` = '$room' "));
                        $now = time();
                        if($now <= $finish)
                        {
                                mysql_query("UPDATE `chat_users_rooms` SET `mod_time` = '$now' WHERE `username` = '$username' AND `room` ='$room'  LIMIT 1") ;
                                if($check != $current){
                                 break;
                                }
                        }
                        else
                        {
                                 break;
                    }
        }
// Get People in chat
                if(mysql_num_rows($getRoomUsers) != $current)
                {
                        $data['numOfUsers'] = mysql_num_rows($getRoomUsers);
                        // Get the user list (Finally!!!)
                        $data['userlist'] = array();
                        while($user = mysql_fetch_array($getRoomUsers))
                        {
                                $data['userlist'][] = $user['username'];
                        }
                        $data['userlist'] = array_reverse($data['userlist']);
                }
                else
                {
                        $data['numOfUsers'] = $current;
                        while($user = mysql_fetch_array($getRoomUsers))
                        {
                                $data['userlist'][] = $user['username'];
                        }
                        $data['userlist'] = array_reverse($data['userlist']);
                }
                echo json_encode($data);

?>

 

 

I was wondering if anyone would help me figure out how to change it to server side. Additionally if there is any way to improve response time on the chat list refresh I'd appreciate assistance on that as well. 

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https://forums.phpfreaks.com/topic/287917-chat-room-maintaining-user-list/
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