将下面的代码粘贴到活动主题函数中。php文件

add_filter( \'woocommerce_email_order_meta_fields\',\'custom_order_email_order_meta_data\', 10, 3 );


function custom_order_email_order_meta_data( $fields, $sent_to_admin, $order ) {

$fields[\'wpcf-purchase-student\'] = array(
    \'label\' => __( \'purchase amount\', \'woocommerce\' ),
    \'value\' =>  get_post_meta( $order->id, \'wpcf-purchase-student\', true ) 
);
return $fields;
}