woocommerce_thankyou hook not working

Question

When I paste the code below directly into the thankyou.php, it works perfectly fine. but when I try to hook it into woocommerce_thankyou, nothing happens.

I'm just getting started with PHP,

add_action('woocommerce_thankyou', 'test_1', 10, 1);

function test_1() {
    $paymethod = $order->payment_method_title;
    $orderstat = $order->get_status();

    if (($orderstat == 'completed') && ($paymethod == 'PayPal')) {
        echo "something";
    } elseif (($orderstat == 'processing') && ($paymethod == 'PayPal')) {
        echo "some other shit";
    } elseif (($orderstat == 'pending') && ($paymethod == 'PayPal')) {
        echo "some other shit";
    }
}

Answer 1

First of all you have to add the function and hook in functions.php file of your active child theme (or theme). Or also in any plugin PHP files. Secondly you need to create an instance/object of order, to access the data.

add_action('woocommerce_thankyou', 'wh_test_1', 10, 1);

function wh_test_1($order_id) { //<--check this line

    //create an order instance
    $order = wc_get_order($order_id); //<--check this line

    $paymethod = $order->payment_method_title;
    $orderstat = $order->get_status();

    if (($orderstat == 'completed') && ($paymethod == 'PayPal')) {
        echo "something";
    } 
    elseif (($orderstat == 'processing') && ($paymethod == 'PayPal')) {

        echo "some other code";
    } 
    elseif (($orderstat == 'pending') && ($paymethod == 'PayPal')) {
        echo "some other code";
    }
}

Hope this helps!