阅读wp_schedule_event() 文档为我提供了如下代码：

add_action(\'cr_paid_link_manager_generate_expiring_link_email_action\',\'cr_paid_link_manager_generate_expiring_link_email\');
wp_schedule_event(time(), \'daily\', \'cr_paid_link_manager_generate_expiring_link_email_action\');

问题是，cr_paid_link_manager_generate_expiring_link_email() 是在每次页面加载时生成的，看起来是这样的。此代码应该每天只发送一次电子邮件。

我尝试设置的第一个参数wp_schedule_event() 到$timestamp_start:

$timestamp_start = \'2011-01-26 00:00:00\';
add_action(\'cr_paid_link_manager_generate_expiring_link_email_action\',\'cr_paid_link_manager_generate_expiring_link_email\');
wp_schedule_event($timestamp_start, \'daily\', \'cr_paid_link_manager_generate_expiring_link_email_action\');

仍然没有结果。代码每分钟都在发送电子邮件。我的代码有什么缺失吗？

function wpsx_7780_myplugin_init() {

  wp_schedule_event(time(), \'daily\', \'cr_paid_link_manager_generate_expiring_link_email_action\');

}
register_activation_hook( __FILE__, \'wpsx_7780_myplugin_init\' );
add_action(\'cr_paid_link_manager_generate_expiring_link_email_action\',\'cr_paid_link_manager_generate_expiring_link_email\');