更改电子邮件主题行

/*
 * Subject filters: 
 *   woocommerce_email_subject_new_order
 *   woocommerce_email_subject_customer_procesing_order
 *   woocommerce_email_subject_customer_completed_order
 *   woocommerce_email_subject_customer_invoice
 *   woocommerce_email_subject_customer_note
 *   woocommerce_email_subject_low_stock
 *   woocommerce_email_subject_no_stock
 *   woocommerce_email_subject_backorder
 *   woocommerce_email_subject_customer_new_account
 *   woocommerce_email_subject_customer_invoice_paid
 **/
add_filter('woocommerce_email_subject_new_order', 'change_admin_email_subject', 1, 2);
 
function change_admin_email_subject( $subject, $order ) {
  global $woocommerce;
 
  $blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);
 
  $subject = sprintf( '[%s] New Customer Order (# %s) from Name %s %s', $blogname, $order->id, $order->billing_first_name, $order->billing_last_name );
 
  return $subject;
}

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。