// HTML CODE:

<form action="index.php?action=admin&admin=add_product" method="post">
 <p>Product ID: <input type="text" name="product_id" /></p>
 <p>Product Categorie: <input type="text" name="categorie" /></p>
 <p>Product Name: <input type="text" name="product_name" /></p>
 <p>Product Description: <input type="text" name="description" /></p>
 <p>Product Manufacturer: <input type="text" name="manufacturer" /></p>
 <p>Product Price: <input type="text" name="price" /></p>
 <p>Product File: <input type="file" name="product_file" /></p>
<input type="submit" name="add" value="add">
</form>






// PHP Code:

    public function display()
    {
        // section .:0000000000000B2F begin
        if (    (array_key_exists('product_id', $this->m_request)) &&
                (array_key_exists('categorie', $this->m_request)) &&
                (array_key_exists('product_name', $this->m_request)) &&
                (array_key_exists('description', $this->m_request)) &&
                (array_key_exists('manufacturer', $this->m_request)) &&
                (array_key_exists('price', $this->m_request))  ) {

                $product_id = $this->m_request['product_id'];
                $categorie = $this->m_request['categorie'];
                $product_name = $this->m_request['product_name'];
                $description = $this->m_request['description'];
                $manufacturer = $this->m_request['manufacturer'];
                $price = $this->m_request['price'];
                $product_file = $this->m_request['product_file'];