Úprava PHP - výpis všech produktů bez zvolení kategorie

<?php
function my_shop() {
    global $wpdb;
    $cat_query = $wpdb->get_results("SELECT * from ".$wpdb->prefix."wc_shop_category ORDER by cat_name ASC");

    $content = '<div class="shop_wrap">';
    $content .= '<div class="shop_cat_wrap">';
    $content .= '<h2 class="product_cat_head">Categories</h2>';
    $content .= '<ul>';
    foreach($cat_query as $category_row) {
        if(isset($_GET['page_id'])) { 
            $attr = "?page_id=".$_GET['page_id']."&shop_cat_id=".$category_row->cat_id;
        } else { 
            $attr = "?shop_cat_id=".$category_row->cat_id;
        }
        $content .= '<li><a href="'.$attr.'">'.$category_row->cat_name.'</a></li>';
    }
    $content .= '</ul>';
    $content .= '<a href="#" id="res_btn">Caretogies</a>';
    $content .= '</div><!--shop cat wrap ends here.-->';
    $content .= '<div class="shop_right_wrap">';
    if(isset($_SESSION['success_message'])) {
    $content .= '<div class="success_message">'.$_SESSION['success_message'].'</div><!--add to cart success message here.-->';
    unset($_SESSION['success_message']);
    }
    if(isset($_GET['shop_cat_id'])) { 
        $products_row = $wpdb->get_results("SELECT * from ".$wpdb->prefix."wc_product_menu WHERE product_category='".$_GET['shop_cat_id']."' ORDER by product_name ASC");
        $cat_q = $wpdb->get_results("SELECT * from ".$wpdb->prefix."wc_shop_category WHERE cat_id='".$_GET['shop_cat_id']."'");        
        
        foreach($cat_q as $category_r) {
            $content .= '<h1>'.$category_r->cat_name.'</h1>';
            if($category_r->cat_description != '') { 
                $content .= '<p>'.$category_r->cat_description.'</p><hr>';
            } else { 
                $content .= '<hr>';
            }
        }
    } else { 
        $products_row = $wpdb->get_results("SELECT * from ".$wpdb->prefix."wc_product_menu WHERE product_id='atalfa' ORDER by product_name ASC");
        //Zaib you can work here.
        $content .= '<h2>Select a category.</h2>';
        $content .= 'Please select a category to list related products.';
        //zaib you have to end work here.
        
    }
    foreach($products_row as $product_row) {
    $content .= '<div class="product">';
    if($product_row->product_thumb != '') { 
        $product_thumb = '<img src="'.$product_row->product_thumb.'" class="product_thumb" width="50px" height="50px" />';
    } else { 
        $product_thumb = '';
    }
    if($product_row->product_price != '') { 
        $product_price = '<br><strong>Price: </strong>'.$product_row->product_price;
    } else { 
        $product_price = '';
    }
    $content .= '<div class="product_detail"><h3>'.$product_row->product_name.'</h3><p class="description">'.$product_thumb.''.$product_row->product_description.$product_price.'</p></div>';
    $content .= '<div class="product_form">';
    $content .= '<form name="add_product" method="post">';
    $content .= '<input type="text" name="comments" class="comment" placeholder="Comment" /><br>';
    $content .= '<input type="text" name="size" placeholder="size" />';
    $content .= '<input type="text" name="qty" placeholder="QTY" required="required" />';
    $content .= '<input type="hidden" name="product_id" value="'.$product_row->product_id.'" />';
    $content .= '<input type="submit" value="Add to cart" />';
    $content .= '</form>';
    $content .= '</div><!--product form ends here.-->';
    $content .= '<div class="clearIt"></div>';
    $content .= '</div><!--product ends here.-->';    
    }//end foreach
    $content .= '</div><!--right side ends here.-->';
    $content .= '<div class="clearIt"></div>';
    $content .= '</div><!--Shop Wrap Ends here.-->';
    echo $content;
}//get_cat_and_items ends here.
add_shortcode('my_shop', 'my_shop');
//category items