PHP mysql search multiple tables using a keyword

Question

I have three tables in my database which are:

messages
topics
comments

Each of these tables has two fields called \'content\' and \'title\'

Answer 1

Html Search form:

Search.php:

link, $fm->validation($_GET['search']));
    }
    else{
        header("Location:404.php");
    }
?>
select($query);
    if ($post) {
        while ($result = $post->fetch_assoc()) {
            echo"Database data like, $result['title']";
        }
    }
    else{
        echo "result Not found";
    }

include database.php in search.php

class Database{
    public function select($query){
        $result = $this->link->query($query) or die($this->link->error.__LINE__);
        if($result->num_rows > 0){
            return $result;
        }
        else {
            return false;
        }
    }
}
$db = new Database();