WooCommerce：添加下拉选择字段到“我的帐户”注册表单

相信大家在很多网站都见过：

注册账号时，有个下拉字段，让你选择【你是如何知道我们的网站：谷歌、百度、YouTube等】，现在我们也来实现一下：

function fjj_extra_register_select_field() {?>
<p class="form-row form-row-wide">
<label for="find_where"><?php _e( 'Where did you find us?', 'woocommerce' ); ?>  <span class="required">*</span></label>
<select name="find_where" id="find_where" />
    <option value="goo">Google</option>
    <option value="fcb">Facebook</option>
    <option value="twt">Twitter</option>
</select>
</p>
<?php }
add_action( 'woocommerce_register_form', 'fjj_extra_register_select_field' );
  
function fjj_save_extra_register_select_field( $customer_id ) {
if ( isset( $_POST['find_where'] ) ) {
        update_user_meta( $customer_id, 'find_where', $_POST['find_where'] );
}
}
add_action( 'woocommerce_created_customer', 'fjj_save_extra_register_select_field' );

add_action( 'show_user_profile', 'fjj_show_extra_register_select_field', 30 );
add_action( 'edit_user_profile', 'fjj_show_extra_register_select_field', 30 ); 
add_action( 'woocommerce_edit_account_form', 'fjj_show_extra_register_select_field', 30 );
   
function fjj_show_extra_register_select_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=""><?php _e( 'Where did you find us?', 'woocommerce' ); ?>  <span class="required">*</span></label>
<select name="find_where" id="find_where" />
    <option disabled value> -- select an option -- </option>
    <option value="goo" <?php if (get_the_author_meta( 'find_where', $user->ID ) == "goo") echo 'selected="selected" '; ?>>Google</option>
    <option value="fcb" <?php if (get_the_author_meta( 'find_where', $user->ID ) == "fcb") echo 'selected="selected" '; ?>>Facebook</option>
    <option value="twt" <?php if (get_the_author_meta( 'find_where', $user->ID ) == "twt") echo 'selected="selected" '; ?>>Twitter</option>
</select>
</p>
<?php}
  
add_action( 'personal_options_update', 'fjj_save_extra_register_select_field_admin' );    
add_action( 'edit_user_profile_update', 'fjj_save_extra_register_select_field_admin' );   
add_action( 'woocommerce_save_account_details', 'fjj_save_extra_register_select_field_admin' );
function fjj_save_extra_register_select_field_admin( $customer_id ){
if ( isset( $_POST['find_where'] ) ) {
   update_user_meta( $customer_id, 'find_where', $_POST['find_where'] );
}
}