arguments for comment_notification_text filter

For the arguments, check the source:

$notify_message  = apply_filters( 'comment_notification_text',       $notify_message,  $comment_id );

You have two parameters. The first is the notification text itself, prior modification by your filter. It is constructed earlier in the same function and is different for comments, trackbacks, and pingbacks. The second parameter, as you might guess from the name, is the comment ID. That is all correct, as per the Codex entry you found.

However, your problem is that only the first parameter is passed by default. If you want any of the others you have to ask for them by means of the fourth parameter of add_filter. 

add_filter("comment_notification_text", "x99", 1, 2);

The third parameter is a priority. You can raise that or lower it depending on your needs. 1 should run your filter early.

Related Posts:

  1. How to add headers to outgoing email?
  2. Editing ‘Password Reset’ E-mail
  3. wp_mail – Remove sitename from email subject
  4. How to disable all WordPress emails modularly and programatically?
  5. wpmu_signup_user_notification filter not working
  6. Is it possible to put the add-filter()-hook into a function?
  7. How can I change the email that is inside the default email texts of wordpress?
  8. Help with filter for wp_notify_moderator()
  9. Error using wp_mail inside custom function
  10. Register new user, assign custom role then send email
  11. Which Filter Do I Use To Modify The Subject Of The Retrieve Password Notification Email?
  12. Email Obfuscation: Is antispambot() Acceptable? [closed]
  13. comment_notification_text filter not working
  14. Would like to use hook or filters to customize email templates
  15. Filter wp_mail based on content type
  16. Sanitize and data validation with apply_filters() function
  17. How many filter/action hooks are healthy?
  18. Filter specific shortcode output?
  19. Insert new element to array with add_filter
  20. How to hook into unregistering a widget instance?
  21. How can I extend the Gutenberg table block transform to allow colspans/rowspans on pasted table elements?
  22. How do I use the ‘http_request_host_is_external’ filter
  23. get_option() filtering and getting out of recursion
  24. Get excerpt from $post->post_content
  25. How can I add information underneath the user’s name on the users.php page?
  26. AJAX filter posts on click based on category
  27. How can I filter Microsoft Word gunk from pasted content?
  28. How do I know if author field was changed on post save?
  29. Allow Profile HTML for select users
  30. WordPress 3.5+ upload tool filter
  31. Search with filters and title
  32. Use content custom filter for all shortcodes
  33. Filter all html output
  34. Which hook is fired when inserting media into a post
  35. How to specify which category of the post to use in case of multiple categories
  36. Return array of images after content
  37. failed to filter hook `get_terms_defaults`
  38. Filter list by a unique meta value dilemma
  39. How to use shortcode attribute in separate function
  40. return values from hooks do_action and apply_filters, which is better
  41. Is it possible to track down Actions and Filters?
  42. get_title without filter(the_title)
  43. How can filters be run when they are never applied?
  44. How to filter a wordpress core function?
  45. Adding id and class to the search input in WordPress search form
  46. get_bookmarks filter not supplying query argument (wp 3.1)
  47. Filter Posts by current Month
  48. Is there a filter called ‘network_admin_init’?
  49. Manipulating show_on_front, page_on_front, page_for_posts and template hierarchy
  50. Post Content, Special Characters and Filters
  51. Correct method of redirecting user login
  52. How to filter for user registration, be able to throw error message
  53. Admin filter for product SKU?
  54. Contact Form 7: Make field required after checkbox is checked
  55. Customize title, description and focused keyword [closed]
  56. Filtering the post list in the admin area
  57. Filter pre_get_posts does not modify Mine/All/Pending
  58. How to check if a protected hook is hooked?
  59. Can i use multiple ‘the_content’ filters?
  60. term_link filter gives less atributes
  61. Add mime types with plugin
  62. Filter media upload attachment meta
  63. Filter have_posts()/ the_post()
  64. Filter wp_redirect() to stop redirect under certain condition
  65. Echo string in admin panel footer beside version no
  66. How to change default text for specific post type
  67. Add PHP code after title in single post pages?
  68. How to stop the deduction in “wp_term_taxonomy” count, when the post is deleted?
  69. How To Get Search Term and Use in Function
  70. Hook in a sidebar widget and add some markup
  71. preg_match() not working with post content
  72. return get_the_tag_list with whitespace removed
  73. ‘manage_users_custom_column’ is a filter, but ‘manage_posts_custom_column’ is an action. Why?
  74. Line Breaks are stripped off when direction property is found
  75. Modify author url display in edit-comments.php
  76. Need to suspend RSS feed while repairing missing old post
  77. WordPress remove_filter not working
  78. How to exclude or include categories in wp rest API without query parameters?
  79. Filter Post Title without affecting screen-reader-text
  80. Hook to change the site URL
  81. Replace a specific URL on all apperances on the Website (Maybe a filter?)
  82. Strange behaviour of REGEX in a WordPress filter (trying to suppress emtpy paragraphs)
  83. Modify Contextual Help
  84. Widget image reorganize layout
  85. WordPress set featured image to first image of the post
  86. Modify WordPress search behaviour in backend?
  87. Modify category listing API response
  88. Auto-generated excerpt with shortcode and read more button/text link
  89. Converting restricted html in comments to bbcode
  90. What is the proper/best way to have multiple add_filter for wp-job-manager-resume
  91. Modify WooCommerce email shipping text value
  92. How do I add a class to all sidebars to let a Google Custom Search Engine know not to index the content?
  93. How to replace all images in all posts and pages with a different size?
  94. Using Filters To Change Page Title
  95. How to add a class to Buddypress avatars in the Activity stream? [closed]
  96. using posts_where for meta data on pre_get_posts
  97. can’t output gray scaled image I’ve created using add_image_size
  98. How properly write function to filter content in a template for plugin “multiple content blocks”
  99. ACF Load Field Groups Programmatically [closed]
  100. Limit total tags in the_content