我对cron计划功能有问题，它不想用wp_mail() 作用

This is my code:

它被放置在函数中。php

<?php

    add_filter(\'cron_schedules\', \'add_review_invites_schedule\');
    function add_review_invites_schedule($schedules){
        $schedules[\'send_review_invites_interval\'] = array(
                \'interval\' => 5*60,
                \'display\' => __(\'Every Five Minutes\'),
        );
        return $schedules;
    }

   if (!wp_get_schedule(\'send_review_invites_event\')) {
       wp_schedule_event( time(), \'send_review_invites_interval\', \'send_review_invites_event\');
   }

   add_action( \'send_review_invites_event\', \'send_review_invites\' );

   function send_review_invites(){
       echo \'test\';
       wp_mail( \'[email protected]\', \'Automatic email\', \'Automatic scheduled email from WordPress to test cron\');
   }

?>

您应该知道，我已将wp cron连接到服务器cron，因此它在我的网站上运行此代码。我还把define(\'DISABLE_WP_CRON\', false); 在wp配置中。php。

服务器cron运行时，我在邮件中得到的输出test. 这表明函数send_review_invites() 正在运行。但不知何故，我没有收到另一封电子邮件，地址是wp_mail() 作用

提前感谢您的帮助。

// Set $to as the email you want to send the test to.
$to = "[email protected]";

// Email subject and body text.
$subject = \'wp_mail function test\';
$message = \'This is a test of the wp_mail function: wp_mail is working.woo!\';
$headers = \'\';

// Load WP components, no themes.
define(\'WP_USE_THEMES\', false);
require(\'wp-load.php\');

// send test message using wp_mail function.
$sent_message = wp_mail( $to, $subject, $message, $headers );

//display message based on the result.
if ( $sent_message ) {
    // The message was sent.
    echo \'The test message was sent. Check your email inbox.\';
} 
else {
    // The message was not sent.
    echo \'The message was not sent!\';
}

add_action(\'wp_mail_failed\', \'log_mailer_errors\', 10, 1);
function log_mailer_errors( $wp_error ){
  $fn = ABSPATH . \'/mail.log\'; // say you\'ve got a mail.log file in your server root
  $fp = fopen($fn, \'a\');
  fputs($fp, "Mailer Error: " . $wp_error->get_error_message() ."\\n");
  fclose($fp);
}