WooCommerce add checkbox to Registration Form

woo-add-checkbox-register-form.php

<?php 
/***
    SETUP
custom fields
  @hook woocommerce_register_form_start
  @hook woocommerce_edit_account_form 
  @hook woocommerce_save_account_detail
  @altUse woocommerce_after_order_notes to add to checkout
****/

// -------------------
// 1. Show field @ My Account Registration
 
add_action( 'woocommerce_register_form_start', 'celedonia_add_name_woo_account_registration' );
 
function celedonia_add_name_woo_account_registration() {
    ?>
 
    <p class="form-row form-rwo-first"><span style="float:left;width:47%">
    <label for="reg_billing_first_name"><?php _e( 'Nombre', 'woocommerce' ); ?>
 <span class="required">*</span></label>
    <input type="text" class="input-text" name="billing_first_name" 
id="reg_billing_first_name" value="<?php if ( ! empty( $_POST['billing_first_name'] ) ) 
esc_attr_e( $_POST['billing_first_name'] ); ?>" />
    </span>
 
    <span style="width:47%;float:right;display:block;">
    <label for="reg_billing_last_name"><?php _e( 'Apellidos', 'woocommerce' ); ?>
 <span class="required">*</span></label>
    <input type="text" class="input-text" name="billing_last_name" 
id="reg_billing_last_name" value="<?php if ( ! empty( $_POST['billing_last_name'] ) ) 
esc_attr_e( $_POST['billing_last_name'] ); ?>" />
    </span></p>
 
    <div class="clear"></div>
 <br>
    <?php
}
 
add_action( 'woocommerce_register_form', 'celedonia_extra_register_checkbox_field' );
 
function celedonia_extra_register_checkbox_field() {
   
    ?>
<p class="form-row form-row-wide">
<label for="cel_news" style="color:#419a84">
<input type="hidden" name="cel_news" id="cel_news" value="no" />
<input type="checkbox" name="cel_news" id="cel_news" value="si" />
<?php _e( 'Recibiré quincenalmente los trabajos más actuales, ofertas y el magazine ', 
'woocommerce' ); ?></label>
</p>

 
<?php
   
}
 
// -------------------
// 2. Save field on Customer Created action
 
add_action( 'woocommerce_created_customer', 'celedonia_save_extra_register_checkbox_field' );
  
function celedonia_save_extra_register_checkbox_field( $customer_id ) {
if ( isset( $_POST['cel_news'] ) ) {
        update_user_meta( $customer_id, 'cel_news', $_POST['cel_news'] );
}
 if ( isset( $_POST['billing_first_name'] ) ) {
        update_user_meta( $customer_id, 'billing_first_name', sanitize_text_field( $_POST['billing_first_name'] ) );
        update_user_meta( $customer_id, 'first_name', sanitize_text_field($_POST['billing_first_name']) );
    }
    if ( isset( $_POST['billing_last_name'] ) ) {
        update_user_meta( $customer_id, 'billing_last_name', sanitize_text_field( $_POST['billing_last_name'] ) );
        update_user_meta( $customer_id, 'last_name', sanitize_text_field($_POST['billing_last_name']) );
    }
}
 
// -------------------
// 3. Display Select Field @ User Profile (admin) and My Account Edit page (front end)
  
add_action( 'show_user_profile', 'celedonia_show_extra_register_checkbox_field', 30 );
add_action( 'edit_user_profile', 'celedonia_show_extra_register_checkbox_field', 30 ); 
add_action( 'woocommerce_edit_account_form', 'celedonia_show_extra_register_checkbox_field', 30 );
  
function celedonia_show_extra_register_checkbox_field($user){ 
   
  if (empty ($user) ) {
  $user_id = get_current_user_id();
  $user = get_userdata( $user_id );
  }
   
?>    
       
<p class="form-row form-row-wide">
<label for="cel_news">
<input type="hidden" name="cel_news" id="cel_news" value="no" />
<input type="checkbox" name="cel_news" id="cel_news" value="si" />
<?php _e( 'Recibiré quincenalmente los trabajos más actuales, ofertas y el magazine', 
'woocommerce' ); ?></label>
</p>
 
<?php
 
}
// -------------------
// 4. Save User Field When Changed From the Admin/Front End Forms
  
add_action( 'personal_options_update', 'celedonia_save_extra_register_checkbox_field_admin' );    
add_action( 'edit_user_profile_update', 'celedonia_save_extra_register_checkbox_field_admin' );   
add_action( 'woocommerce_save_account_details', 'celedonia_save_extra_register_checkbox_field_admin' );
  
function celedonia_save_extra_register_checkbox_field_admin( $customer_id ){        
update_user_meta( $customer_id, 'cel_news', $_POST['cel_news'] );
} 
///////////////////////////////
// 2. VALIDATE FIELDS
 
add_filter( 'woocommerce_registration_errors', 'celedonia_validate_name_fields', 10, 3 );
 
function celedonia_validate_name_fields( $errors, $username, $email=null ) {
    if ( isset( $_POST['billing_first_name'] ) && empty( $_POST['billing_first_name'] ) ) {
        $errors->add( 'billing_first_name_error', __( '<strong>!</strong>: Nombre!', 'woocommerce' ) );
    }
    if ( isset( $_POST['billing_last_name'] ) && empty( $_POST['billing_last_name'] ) ) {
        $errors->add( 'billing_last_name_error', __( '<strong>!</strong>: Apellidos!.', 'woocommerce' ) );
    }
    return $errors;
}
 

good