Preselect and restrict to one city and state on checkout in WooCommerce

HowTo Code Snippets
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Preselect and restrict to one city and state on checkout in WooCommerce.

Snippet Type

Execute on Child Sites

Snippet

// default checkout country
add_filter( 'default_checkout_billing_country', 'change_default_checkout_country' );
add_filter( 'default_checkout_shipping_country', 'change_default_checkout_country' );
function change_default_checkout_country() {
    return 'PK'; // country code
}

// default checkout state
add_filter( 'default_checkout_billing_state', 'change_default_checkout_state' );
add_filter( 'default_checkout_shipping_state', 'change_default_checkout_state' );
function change_default_checkout_state() {
    return 'SD'; // state code
}

// Setting one state only
add_filter( 'woocommerce_states', 'custom_woocommerce_state', 10, 1 );
function custom_woocommerce_state( $states ) {
    // Returning a unique state
    return array('PK' => array('SD' => 'Sindh'));
}

// Only one city at checkout
add_filter( 'woocommerce_checkout_fields', 'custom_checkout_fields', 10, 1 );
function custom_checkout_fields( $fields ) {

    $fields['billing']['billing_city']['type'] = 'select';
    $fields['billing']['billing_city']['options'] = array('Karachi' => 'Karachi');
    $fields['shipping']['shipping_city']['type'] = 'select';
    $fields['shipping']['shipping_city']['options'] = array('Karachi' => 'Karachi');

    return $fields;
}