How to hide state field on WooCommerce checkout based on country - php

Question

Based on How to remove all Woocommerce checkout billing fields without errors answer code, this is my code attempt:
add_action( 'woocommerce_before_checkout_form', 'hide_checkout_billing_country', 5 );
function hide_checkout_billing_country() {
echo '<style>#billing_state_field{display:none !important;}</style>';
}
add_filter('woocommerce_billing_fields', 'customize_checkout_fields', 100 );
function customize_checkout_fields( $fields ) {
if ( is_checkout() ) {
// HERE set the required key fields below
$chosen_fields = array('first_name', 'last_name', 'address_1', 'address_2', 'city', 'postcode', 'country', 'state');
foreach( $chosen_fields as $key ) {
if( isset($fields['billing_'.$key]) && $key !== 'state') {
unset($fields['billing_'.$key]); // Remove all define fields except country
}
}
}
return $fields;
}
My goal is to hide the state field depenging on country. Eg.
If country = Italy then the state field is shown
If country = France then state field is hidden..
So I tried to insert an if condition but without the desired result.
If someone could give me advice, it would be very appreciated.

Answer 1

Your code contains some errors and shortcomings
The modification in your code attempt, based on the state does not apply to the country
Your code contains an Fatal error: "Uncaught Error: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "customize_checkout_fields" not found or.. I've edited this though
You can use WC()->customer->get_billing_country() to get the billing country
So you get:
function filter_woocommerce_billing_fields( $fields ) {
// Returns true when viewing the checkout page
if ( is_checkout() ) {
// Get billing country
$billing_country = WC()->customer->get_billing_country();
// Multiple country codes can be added, separated by a comma
$countries = array( 'IT' );
// NOT in array
if ( ! in_array( $billing_country, $countries ) ) {
// HERE set the fields below, multiple fields can be added, separated by a comma
$chosen_fields = array( 'state' );
// Loop through
foreach( $chosen_fields as $key ) {
// Isset
if ( isset( $fields['billing_' . $key] ) ) {
// Remove all defined fields
unset( $fields['billing_' . $key] );
}
}
}
}
return $fields;
}
add_filter( 'woocommerce_billing_fields', 'filter_woocommerce_billing_fields', 10, 1 );