PHP/MySQL Fatal memory allocation error

Im getting the Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 4294967296 bytes) error on this line:

$stmt -> bind_result($title, $author, $contents, $date, $image, $status);

of a mysqli/php statement, the query is a select statement that gets 1 row of text from a database, does anyone know whats gone wrong?

Full (and only) function on this page:

function get_selected_article($post_type, $post_id, $post_name)
{

    $con = new mysqli("---my ip---", "---my user---", "---my pass---", "---my database---");

if (mysqli_connect_errno())
{
    echo "A problem has occurred";
    exit();
}

if ($stmt = $con -> prepare("SELECT `title`, `author`, `content`, `date`, `image`, `status` FROM ---my table--- WHERE `id` = ? AND `type` = ? ORDER BY `id` DESC"))
{

    $stmt -> bind_param("is", $post_id, $post_type); // "i" for int
    $stmt -> execute();
    $stmt -> bind_result($title, $author, $contents, $date, $image, $status);

    while ($stmt -> fetch())
    {
        echo "";
        echo "";
        echo "";
        echo "";

        echo "
".$date."
".$post_type."
".$author."
".$title."
".$content."
";
    }

    $stmt -> close();
}

    $con -> close();
} 

Thanks

Answer

Your content column is LONGTEXT - "A TEXT column with a maximum length of 4,294,967,295 or 4GB (232 – 1) characters." from the docs: http://dev.mysql.com/doc/refman/5.0/en/string-type-overview.html