我想在Wp3中安排一个cron作业。5.1向预约待定的客户发送电子邮件。

下面是我正在尝试的一些代码：

For the testing am scheduling corn for each second to insert row in table.

// insert row every second
add_action(\'wp\', \'my_activation\');
function my_activation() {
    if ( !wp_next_scheduled( \'my_event\' ) ) {
        wp_schedule_event( time(), \'hourly\', \'my_event\');
    }
}

add_action(\'my_event\', \'do_this_event\');
function do_this_event() {
    global $wpdb;
    $wpdb->query("INSERT INTO `wordpress-testing`.`wp_test` (`id`, `text`) VALUES (NULL, \'b\');");
}

wp_get_schedules(\'my_event\');

//custom recurrence
add_filter( \'cron_schedules\', \'cron_add_every_sec\' );
function cron_add_every_sec( $schedules ) {
    $schedules[\'hourly\'] = array(
        \'interval\' => 1,
        \'display\' => __( \'Do Secondly\' )
    );
    return $schedules;
}

Is cron run automatically after activation once OR its need to recurring visit after scheduled time past?