How to add custom fields to WooCommerce registration form

Question

I have seen similar questions but couldn\'t find a solution for me.

I am trying to add custom fields to WooCommerce registration form, specifically first and last na

Answer 1

 'text',
            'required'    => true, // just adds an "*"
            'label'       => 'First name'
        ),
        ( isset($_POST['billing_first_name']) ? $_POST['billing_first_name'] : '' )
    );
    woocommerce_form_field(
        'billing_last_name',
        array(
            'type'        => 'text',
            'required'    => true, // just adds an "*"
            'label'       => 'Last name'
        ),
        ( isset($_POST['billing_last_name']) ? $_POST['billing_last_name'] : '' )
    );
    woocommerce_form_field(
        'billing_phone',
        array(
            'type'        => 'tel',
            'required'    => true, // just adds an "*"
            'label'       => 'Phone'
        ),
        ( isset($_POST['billing_phone']) ? $_POST['billing_phone'] : '' )
    );
 
}
/**
 * To validate WooCommerce registration form custom fields.
 */
add_action( 'woocommerce_register_post', 'misha_validate_fields', 10, 3 );
 
function misha_validate_fields( $username, $email, $errors ) {
 
    if ( empty( $_POST['billing_first_name'] ) ) {
        $errors->add( 'billing_first_name_error', 'First name is required!' );
    }
    if ( empty( $_POST['billing_last_name'] ) ) {
        $errors->add( 'billing_last_name_error', 'Last name is required!' );
    }
    if ( empty( $_POST['billing_phone'] ) ) {
        $errors->add( 'billing_phone_error', 'Phone is required!' );
    }
 
}
/**
 * To save WooCommerce registration form custom fields.
 */
add_action( 'woocommerce_created_customer', 'misha_save_register_fields' );
 
function misha_save_register_fields( $customer_id ){
   //First name field
    if ( isset( $_POST['billing_first_name'] ) ) {
        //update_user_meta( $customer_id, 'country_to_visit', wc_clean( $_POST['country_to_visit'] ) );
        update_user_meta($customer_id, 'first_name', sanitize_text_field($_POST['billing_first_name']));
        update_user_meta($customer_id, 'billing_first_name', sanitize_text_field($_POST['billing_first_name']));
    }
    //Last name field
    if (isset($_POST['billing_last_name'])) {
        update_user_meta($customer_id, 'last_name', sanitize_text_field($_POST['billing_last_name']));
        update_user_meta($customer_id, 'billing_last_name', sanitize_text_field($_POST['billing_last_name']));
    }
    // WooCommerce billing phone
    if ( isset( $_POST['billing_phone'] ) ) {
        update_user_meta( $customer_id, 'billing_phone', sanitize_text_field( $_POST['billing_phone'] ) );
    }
 
}
?>