Unexpected column 'message' in 'field list' - php

Question

I'm trying to create a PHP forum page uses sessions. Every time I try to post a comment I keep getting the same error, not sure where I'm going wrong with this
Here's my code for the form:
session_start();
if(!isset($_SESSION['user_id'])){
require('login_tools.php');
load();
}
$page_title = 'Post Message';
include('includes/header.html');
echo "<h1>Home</h1>
<p>You are now logged in, {$_SESSION['first_name']}
{$_SESSION['last_name']}
</p>";
echo '<form action = "post_action.php" method = "POST" accept-charset = "utf-8">
<p>Subject:<br/>
<input name = "subject" type = "text" size = "64"</p>`
<p>Message:<br/>
<textarea name = "message" rows = "5" cols = "50">
</textarea></p>
<p><input type = "submit" value = "Submit"></p>
</form>';
Here's the code for the post action:
session_start();
require('login_tools.php');
if(!isset($_SESSION['user_id'])){
load();
}
$page_title = 'Post Error';
include('includes/header.html');
echo '<div id = "content">';
if($_SERVER['REQUEST_METHOD']=='POST'){
if(empty($_POST["subject"])){
echo '<p class = "main">Please enter a subject for this post</p>';
}
if(empty($_POST["message"])){
echo '<p class = "main">Please enter a message for this
post';
}
if(!empty($_POST['subject']) && !empty($_POST['message'])){
require('../connect_db.php');
$q = "INSERT INTO forum
(first_name,last_name,subject,messsage,post_date)
VALUES(
'{$_SESSION[first_name]}',
'{$_SESSION[last_name]}',
'{$_POST[subject]}',
'{$_POST[message]}',
NOW())";
$r = mysqli_query($dbc,$q);
if(mysqli_affected_rows($dbc)!=1){
echo '<p>Error</p>'.mysqli_error($dbc);
}
else{
load('forum.php');
}
mysqli_close($dbc);
}
}

Answer 1

There is a spelling mistake
$q = "INSERT INTO forum
(first_name,last_name,subject,messsage,post_date)
It should be message

Answer 2

The PHP statement which generates the SQL is missing quote marks around the member names of $_SESSION.
I would write
$q = "INSERT INTO forum
(first_name,last_name,subject,messsage,post_date)
VALUES('" .
$_SESSION['first_name'] . "','" .
$_SESSION['last_name'] . "','" .
$_POST['subject'] . "','" .
$_POST['message'] . "'," .
"NOW())";