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Firstly sorry for my English. I want to send random Messaging but there are some conditions.

I have two table. Users(id, name, tags) Messages(id, sender, received, message)

Tags column (book, movie, travel) max 10 tags. The data is kept this way.

When an active user sends a message. Forward the message to the X user. Rules : 1. X user: A user who has never received a message and x user's tags must most similar the sender and x user must have never received a message from an Active user before.

I hope I could tell. Thank you

What I have tried:

$id = $_SESSION["id"];
$Activeuserstags = explode(",", $_SESSION["tags"]);

                $query=$db->prepare("select id,tags from users where id!=? and id not in (select receivedid from messages)");
                $user = $query->fetchAll(PDO::FETCH_ASSOC);
                foreach($user as $row){
                     $randomusertags=explode(",", $row["tags"]);
                     $result = array_intersect($Activeuserstags, $randomusertags);

                         // there is similar tags

                         // there is no similar tags

Updated 25-Nov-18 20:55pm

1 solution

If this is not easy. Please look this.

*I want to find the user whose interests are most similar to me.

Tags coloumn (book,movie,chat) There's a comma between them.

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