在我们的WordPress网站上，我们正在使用Events Manager Pro插件。这允许我们创建事件。然而，我们需要在活动结束日期后1天向与会人员发送一封感谢电子邮件。

我已经写好了：

add_action( \'em_bookings_added\', \'mail_after_completion\' );
function mail_after_completion (){

global $wpdb;

/*Get the email of who booked */
$person_id = $wpdb->get_var("SELECT person_id FROM mbc_em_bookings ORDER BY booking_date DESC LIMIT 1");
$person_email = $wpdb->get_var( $wpdb->prepare("SELECT user_email FROM mbc_users WHERE ID = %s",$person_id));

/*Get the event finish date */
$event_id = $wpdb->get_var("SELECT event_id FROM mbc_em_bookings ORDER BY booking_date DESC LIMIT 1");
$event_end_date = $wpdb->get_var( $wpdb->prepare("SELECT event_end_date FROM mbc_em_events WHERE event_id = %s",$event_id));


/*Send E-mail to the person who just booked */


    $to = \'$person_email\';  
    $subject = "Thank you for attending";
    $content = "Thank you for attending the event at $event_end_date";
    $status = wp_mail($to, $subject, $content);

    }
 ?>

无论何时预订活动，此功能都会向某人发送电子邮件。然而，我希望这发生在活动结束后1天。我调查了CRON和wp_schedule_single_event() 很多，但似乎不知道如何正确使用它。

如果有人能对此有所了解，我们将不胜感激

亲切的问候！

<?php

wp_schedule_event(time(), \'hourly\', \'em_bookings_added\');

<?php

$future_time = mktime(10,0,0,30,9,2016); // 2016-09-30 10:00:00 UTC
wp_schedule_event($future_time, \'hourly\', \'em_bookings_added\');

// wp-config.php
define(\'DISABLE_WP_CRON\', true);  

// in your crontab
/15 * * * wget -q -O - http://example.com/wp-cron.php?doing_wp_cron >/dev/null 2>&1