Get list of CITIES from Shipping rates based on city - php

Question

So, I was following this example on How to change the city field to a dropdown by Jeroen in my Billing/Shipping section of my site.
/**
* Change the checkout city field to a dropdown field.
*/
function city_to_dropdown( $fields ) {
$city_args = wp_parse_args( array(
'type' => 'select',
'options' => array(
'amsterdam' => 'Amsterdam',
'rotterdam' => 'Rotterdam',
'den-haag' => 'Den Haag',
'utrecht' => 'Utrecht',
'leiden' => 'Leiden',
'groningen' => 'Groningen',
),
), $fields['shipping']['shipping_city'] );
$fields['shipping']['shipping_city'] = $city_args;
$fields['billing']['billing_city'] = $city_args; // Also change for billing field
return $fields;
}
add_filter( 'woocommerce_checkout_fields', 'city_to_dropdown' );
Everything works as expected, but here is what I want to do different.
I want to be able to query all the list of cities from the from shipping rates based on city and display them in the dropdown code above.
So then I wouldn’t have to add the cities manually in multiple places. My list of cities will always be the cities added in using the shipping rates based on city functionality.
What do I need to do to be able to remove the manually entered cities and have something similar to the following :
‘options’ => get_list_cities_from_shipping_rate(),
Question :
What filters or hooks in woocommerce do I have to call to be able to return the list of cities in my function get_list_cities_from_shipping_rate() ?
I'm new to writing these custom codes in wordpress. Any help pointers on how to get this started would be appreciated.
Thank you in advance

Answer 1

Try this:
function get_list_cities_from_shipping_rate( $rate_id ) {
$cities = '';
$key = '_wafs_shipping_method_conditions';
$conditions = get_post_meta( $rate_id, $key, true );
foreach ( (array) $conditions as $group ) {
foreach ( (array) $group as $cond ) {
if ( ! isset( $cond['condition'] ) ) {
continue;
}
if (
'city' === $cond['condition'] &&
'==' === $cond['operator']
) {
$cities .= $cities ? ', ' : '';
$cities .= $cond['value'];
}
}
}
$cities = preg_split( '/, */', $cities );
return array_unique( array_filter( $cities ) );
}
Things to note:
On the WooCommerce → Settings → Advanced Free Shipping page, the $rate_id is the one after the post= as in http://example.com/wp-admin/post.php?post=123&action=edit. Hover on the Free shipping rates table rows and you'd see the Edit URL having that post query.
You must use the city's name and not its slug. E.g. Den Haag instead of den-haag. See the image you provided.