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:

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 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;
    }
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i zrobiłem zamiast tego takiego ifa, ale nie działa:

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    if(isset($_POST['category']));
    {
        $_SESSION['category'] = $_POST['category'];
    }
    if($_SESSION['category'] == "wszystko")
    {
        $_SESSION['category'] = null;
    }
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a cały kod tej funkcji wygląda tak:

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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>';
}
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Pomoże ktoś, jak zrobić tego ifa, żeby działał.