Przekształcenia switcha na ifa Opcje

[TetTheGod]

Witam, mam taki problem że chcę przekształcić switcha z kategoriami na ifa, tak abym mógł dodawac nowe kategorie z poziomu UI, bez grzebania w kodzie.
mam taki kod switcha:

[PHP] pobierz, plaintext 
 
 switch($_POST['category'])
    {
        case'coins':
            $_SESSION['category'] = $_POST['category'];
            break;
        case'testy':
            $_SESSION['category'] = $_POST['category'];
            break;
        case'wszystko':
            $_SESSION['category'] = null;
            break;
        default:
            break;
    }
[PHP] pobierz, plaintext 

i zrobiłem zamiast tego takiego ifa, ale nie działa:

[PHP] pobierz, plaintext 
    if(isset($_POST['category']));
    {
        $_SESSION['category'] = $_POST['category'];
    }
    if($_SESSION['category'] == "wszystko")
    {
        $_SESSION['category'] = null;
    }
[PHP] pobierz, plaintext 

a cały kod tej funkcji wygląda tak:

[PHP] pobierz, plaintext 
function search_product()
{
    $limit = 8;
    $page = $_GET['p'];
    if($page==0 || $page==1)
    {
        $strona= 0;
    }else{
        $strona = ($page*$limit)-$limit;
    }
 
    switch($_POST['category'])
    {
        case'coins':
            $_SESSION['category'] = $_POST['category'];
            break;
        case'testy':
            $_SESSION['category'] = $_POST['category'];
            break;
        case'wszystko':
            $_SESSION['category'] = null;
            break;
        default:
            break;
    }
 
 
    if(isset($_POST['category']));
    {
        $_SESSION['category'] = $_POST['category'];
    }
    if($_SESSION['category'] == "wszystko")
    {
        $_SESSION['category'] = null;
    }
 
 
    switch($_POST['filter'])
    {
        case'najmniejsza':
            if(isset($_SESSION['category']))
            {
                $phpro_category = filter_var($_SESSION['category'], FILTER_SANITIZE_STRING);
                $phpro_search_name = filter_var($_SESSION['product_search'], FILTER_SANITIZE_STRING);
                $stmt = getDBH()->prepare("SELECT * FROM products WHERE name LIKE :search_name AND category=:category ORDER BY price ASC LIMIT $strona,8");
                $stmt->bindValue(':search_name','%'.$phpro_search_name.'%');
                $stmt->bindParam(':category', $phpro_category, PDO::PARAM_STR);
                $stmt->execute();
            }else{
                $phpro_search_name = filter_var($_SESSION['product_search'], FILTER_SANITIZE_STRING);
                $stmt = getDBH()->prepare("SELECT * FROM products WHERE name LIKE :search_name ORDER BY price LIMIT $strona,8");
                $stmt->bindValue(':search_name','%'.$phpro_search_name.'%');
                $stmt->execute();
            }
            break;
        case'najwieksza':
            if(isset($_SESSION['category']))
            {
                $phpro_category = filter_var($_SESSION['category'], FILTER_SANITIZE_STRING);
                $phpro_search_name = filter_var($_SESSION['product_search'], FILTER_SANITIZE_STRING);
                $stmt = getDBH()->prepare("SELECT * FROM products WHERE name LIKE :search_name AND category=:category ORDER BY price DESC LIMIT $strona,8");
                $stmt->bindValue(':search_name','%'.$phpro_search_name.'%');
                $stmt->bindParam(':category', $phpro_category, PDO::PARAM_STR);
                $stmt->execute();
            }else{
                $phpro_search_name = filter_var($_SESSION['product_search'], FILTER_SANITIZE_STRING);
                $stmt = getDBH()->prepare("SELECT * FROM products WHERE name LIKE :search_name ORDER BY price DESC LIMIT $strona,8");
                $stmt->bindValue(':search_name','%'.$phpro_search_name.'%');
                $stmt->execute();
            }
            break;
        default:
            if(isset($_SESSION['category']))
            {
                $phpro_category = filter_var($_SESSION['category'], FILTER_SANITIZE_STRING);
                $phpro_search_name = filter_var($_SESSION['product_search'], FILTER_SANITIZE_STRING);
                $stmt = getDBH()->prepare("SELECT * FROM products WHERE name LIKE :search_name AND category=:category ORDER BY price ASC LIMIT $strona,8");
                $stmt->bindValue(':search_name','%'.$phpro_search_name.'%');
                $stmt->bindParam(':category', $phpro_category, PDO::PARAM_STR);
                $stmt->execute();
            }else{
                $phpro_search_name = filter_var($_SESSION['product_search'], FILTER_SANITIZE_STRING);
                $stmt = getDBH()->prepare("SELECT * FROM products WHERE name LIKE :search_name ORDER BY price LIMIT $strona,8");
                $stmt->bindValue(':search_name','%'.$phpro_search_name.'%');
                $stmt->execute();
            }
            break;
 
    }
 
    echo '<div class="text5">Wyniki wyszukiwania dla: &nbsp;'.$_SESSION['product_search'].'</div>';
    while ($r = $stmt->fetch(PDO::FETCH_ASSOC)) {
 
        echo'
    	<div class="col-sm-6 col-md-3">
	<input type="hidden" name="id" value="'.$r['id'].'">
    <input type="hidden" name="price" value="'.$r['price'].'">
    <input type="hidden" name="count" value="'.$r['name'].'">
		<div class="thumbnail">
			<img src="../graph/'.$r['picture'].'" alt="" class="img-responsive">
			<div class="caption">
				<h3 class="text-left">'.$r['name'].'</h3>
				<p class="text-left">Cena: '.$r['price'].'zł</p>
				<div class="btn-toolbar text-center">
					<button type="submit" name="buy_product" class="btn btn-primary pull-right">Szczegoły</button>
				</div>
			</div>
		</div>
	</div>';
    }
    echo '</div>';
}
[PHP] pobierz, plaintext 

Pomoże ktoś, jak zrobić tego ifa, żeby działał.

[TetTheGod]

Niby jaki warunek ma nie być spełniony skoro jeśli nie ma kategorii to poprostu pokazuje wszystko. Więc nie rozumiem co tu ma spełnianie warunku do tego że nic się nie wyświetla