I can't insert article with character and programing language script into databse

Question

I have project of create something like blog. The problem am facing now.

1. trying to post articles within there are php, html code and contain some character keep failed.
2. later on it try to use htmlspecialchars($_POST['body']). it change but in frontend the results is dont ' me i s't (opsdd) <====> saya whatis ? ! ---

My code:

session_start();
include('../../conn/connect.php');
if (isset($_POST["submit"])) {
    $for_query = '';
    if (!empty($_POST["sub"])) {
        $subject = $_POST['subject'];
        $body = htmlspecialchars($_POST['body']);
        $menu = $_POST['menu'];

        foreach ($_POST["sub"] as $language) {
            $for_query .= $language . ',';
        }

        $year = date("Y");
        foreach ($_FILES['file']['name'] as $key => $name) {
            $size = $_FILES['file']['size'][$key];
            $file = $_FILES['file']['name'][$key];
            $extension = explode('.', $name);
            $extension = end($extension);
            $extension = strtolower($extension);
            $random_name = rand();

            $images = $subject . "." . $extension;
            $save =  $_SESSION['folder'] . '/' . $images;

            $url = $images;
            if (
                $_FILES['file']['error'][$key] == 0 &&
                move_uploaded_file($_FILES['file']['tmp_name'][$key], "../users/{$_SESSION['folder']}/{$images}")
            ) {
                $uploaded[]=$images;

                $for_query = substr($for_query, 0, -2);
                $query = "INSERT INTO content (subject,body,menu,sub,files) VALUES ('$subject','$body','$menu','$for_query','$save')";
                $q = $db->prepare($query);
                $q->execute();
            } else {
            echo "<label class='text-danger'>* Please Select Atleast one</label>";
            }
        }
    }
}