post.php

<?php
session_start();
require_once('class.php');
$user = new User();
if (!$user->isLoggedIn()) {
    header("Location:login_html.php");
}
echo "Welcome ".$_SESSION['user']."<br>";
echo "<a href='redirect.php'>Logout</a> <br>";
$section = $_GET['section'];
if(isset($_POST['submit'])){
    if(empty($_POST['topic']) || empty($_POST['message'])){
        echo "<p style='color:red'>All fields are required</p>";
    }
    else{
        $message = str_ireplace('stupid', 'silly', $_POST['message']);
        $message = $user->escapeInput($message);
        $topic = $user->escapeInput($_POST['topic']);
        $user->createTopic($topic,$message,$_SESSION['user'],$section);
            header("Location:section.php?section=".$section);

    }
}