设置结账字段必填

add_filter( 'woocommerce_checkout_fields', 'woo_filter_account_checkout_fields' );
 
function woo_filter_account_checkout_fields( $fields ) {
  $fields['account']['account_username']['required'] = true;
  $fields['account']['account_password']['required'] = true;
  $fields['account']['account_password-2']['required'] = true;
 
  return $fields;
}

在哪里添加此代码？

将PHP代码放在主题或子主题functions.php文件的底部。