我编写了一个自定义函数，每当一篇文章提交了评论时，通过电子邮件通知一组用户。

更新的用户因帖子而异，并由一个数组定义，该数组包含用户ID生成的电子邮件地址。

该代码的工作原理是，它确实发送了一封通知电子邮件，但由于电子邮件被多次激发（每当加载帖子时），它就失败了

有什么想法吗？我猜是吧comment_post 是正确的钩子，我只需要在代码的某个地方添加一个条件？？

This is placed in single.php

$data = array(
  \'post_id\'     => $post->ID,
  \'title\'       => get_the_title(),
  \'url\'         => get_the_permalink(),
  \'key_holders\' => $dhp->update_emails() // this contains the array of user email addresses
);

comment_notification($data);

This is the code in my custom plugin

add_filter( \'comment_post\', \'comment_notification\' ); 

function comment_notification( $data = array()) {

  if (!empty($data )) {

    $id     = get_comment( $comment_id );

    $parent = $data[\'post_id\'];
    $plot   = $data[\'title\'];
    $url    = $data[\'url\'];
    $key_holders = $data[\'key_holders\']; // this contains the array of user email addresses


    $args = array(
      \'number\' => \'1\',
      // \'post_id\' => $post->ID
    );

    $comment  = get_comments( $args );

    $com_id   = $comment[0]->comment_ID;
    $author   = $comment[0]->comment_author;
    $content  = $comment[0]->comment_content;
    $time     = $comment[0]->comment_date_gmt;

    $subject  = \'Update: \' . $data[\'title\'] . \' [\' . $data[\'post_id\'] . \'/\' . $com_id . \']\';

    $body     = "<p>Hi</p>".
                "<p><b>" . ucwords($author) . "</b> has updated the Damson Home\'s Portal with the following at " . $time . "&hellip;</p>".
                wpautop($content) . "<br><p><a href=\\"" . $url . "#comment-" . $com_id . "\\">See the full comment here.</a></p>" .
                "<p>Warm regards</p>";

    $headers  = array(
      \'Content-Type: text/html; charset=UTF-8\'
    );

    wp_mail( $data[\'key_holders\'], $subject, $body, $headers );


  } else {


    echo  "<h3>Oopse!!</h3>" .
          "<p class=\\"intro\\">Your comment has failed, please try again.</p>" .
          "<p>Please contact us if the problem persists.</p>";

  }


}

更新（格式更好的@swissspidy answer版本）

add_filter( \'comment_post\', \'comment_notification\', 20, 3 ); 


function comment_notification( $comment_ID, $comment_approved, $commentdata) {

  $postid = $commentdata[\'comment_post_ID\']; // this is how you get the post ID

  // Stuff

}