User meta and author meta

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Here’s what I have so far.. 

class emailer {
function notifyHeart($post_ID)  {

    $interests = get_user_meta( get_current_user_id(), 'interests', TRUE );
    $to = the_author_meta( 'user_email', get_current_user_id() );

    if(has_tag($interests[0])) {
        $email = $to;
        mail($email, "An article about Heart", 
          'A new post has been published about heart.');
        return $post_ID;
    }
}
}

add_action('publish_post', array('emailer', 'notifyHeart'));

What I need to do now, before actually sending the email, I need something that checks if the user has an $interest and if so, send them an email. Any help with this?

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  1. class emailer {
  static function notifyHeart($post_ID)  {
    $interests = get_user_meta(get_current_user_id(), 'interests');
    $to = get_the_author_meta( 'user_email', get_current_user_id() );
    $post = get_post($post_ID);

    foreach($interests as $interest) {
      if(has_tag($interest, $post)) {
        $email = $to;
        mail($email, "An article about Heart", 'A new post has been published about heart.');
        break;
      }
    }
  }
}
add_action('publish_post', array('emailer', 'notifyHeart'));

    Here’s a reworked example. It retrieves all the tags you have in database as meta, checks each of them & if it matches the one in that post’s id, it will send the mail & break out of the loop.