Check if `do_action()` in WordPress returns any result

One possible way could be to use PHP’s output buffering via ob_start() like so

ob_start();
do_action('my_hook');

$content = ob_get_contents();
ob_end_clean();

if (empty($content)) {
    // no output generated
} else {
    // had some output
}

Related Posts:

  1. How to know what functions are hooked to an action/filter?
  2. Difference between do_action and add_action
  3. Difference between after_setup_theme and init action hooks?
  4. Trigger custom action when setting button pressed
  5. Please explain how these hooks work
  6. add_action(‘wp_ajax_[action name]’, myfunction) problem
  7. How to remove action hook done in a plugin from functions.php in my theme?
  8. trigger save_post event programmatically
  9. Implementing advanced add_* function wrappers
  10. My add_action (wp_footer, ‘method’) is not calling?
  11. What is the earliest possible hook for safely using `is_front_page`?
  12. Send data to 3rd party api with wp_remote_post on wp_login
  13. is it possible to get the hook name in add_action?
  14. Difference between hooks Plugin_loaded and admin_int?
  15. admin_post hook not called
  16. Check if action hook exists before adding actions to it
  17. How to debug removal of rewrite rule flushing?
  18. after login that will redirect user role into a page
  19. Detect type of post status transition
  20. Create hooks based on an array of hook names?
  21. Hook before inserting user into database [duplicate]
  22. How to use the post_updated hook before and after arguments
  23. Is there a recover_post hook to go with trash_post hook?
  24. WP Admin Bar frontend issue with dashicon deregister
  25. How can i trigger an action manually?
  26. wp_redirect() not working on form submission with init hook
  27. add_action for lost_password or modify wp-login.php?action=lostpassword
  28. Run add_action hook if condition
  29. Add my own function to existing WooCommerce hook
  30. Empty Super Cache programmatically (with ACF action) [closed]
  31. How to use do_action_ref_array?
  32. Admin Hook at the Login Page
  33. How to find hooks as per Just-In-Time approach?
  34. How To Make Sure That My Action Hook Executes Last
  35. Does update_comment_meta hook exists?
  36. how to determine how many and what kind of arguments are passed to hooks
  37. WP CLI Get all Enqueued Scripts and Styles
  38. Delay an action until current action is completed
  39. What’s hook to use immediately after a user is authentcated [duplicate]
  40. Looking for a hook for post.php
  41. Save User Meta Email Address in Lowercase
  42. Save acf field data via acf/save_post before post is saved
  43. Execute JavaScript in WordPress Hook
  44. schedule event in class oriented plugin
  45. Hooks are not being removed in child theme
  46. How to replace a function using a child theme?
  47. Removing parent theme action on pluggable function not working
  48. Which action hook should I use to intercept a form upon submission?
  49. Would there be anything stopping me from removing both wp_head and wp_footer?
  50. Is it possible to add the_content filter upon login?
  51. WordPress wp_loaded action hook
  52. add_action second argument missing
  53. I would like to send a notification email (Asana) whenever something is published (posts, pages, custom post types) [duplicate]
  54. admin_notices action doesn’t trigger within save_post action
  55. I don’t understand how add_action and do_action work in tandem. The former executes the code already…what is do_action for?
  56. How to cancel an action hooked to untrash_post? or any hook
  57. Add Different Actions To Different Page’s wp_footer
  58. add_action hook for publish_post not working
  59. Hook for inserting?
  60. dynamic add_action according to child pages (for homepage control)
  61. Remove action in a parent theme from the child theme
  62. Remove action within a class in a parent theme’s includes folder from the child theme
  63. Remove genesis_404 hook from genesis_loop [closed]
  64. Add html code in admin page
  65. What hook to add at start of WordPress load
  66. A good hook to check authorization and redirect?
  67. Adding custom Bulk Actions
  68. What hook to use to redirect based on $post
  69. Is there a author_update action?
  70. Restrict editing of post type to list stored in user meta
  71. How to stop execution of a function via add_action hook?
  72. Can we change the hook firing sequence?
  73. changing genesis_before_while in new theme framework
  74. Rewrite the search page to use an appended slug + parameter
  75. How to call do_action() to pass arguments to hooked functions that take different number of args?
  76. remove_action not working for a function
  77. do_action not working in loop
  78. add_action doesn’t work for my function
  79. profile_update hook does not fire from front-end
  80. Add HTML code before the title of the Tag page
  81. Check if front page within function passed to action
  82. Hooks with same priority number. Can one stack items returned in divs, position: absolute each with their own z-index?
  83. Can add_image_size be added earlier
  84. $new_pass always returns null – password_reset hook
  85. Why does get_post() not return anything?
  86. WordPress save_post hook not firing when checking if _GET[‘post’] is set
  87. Object oriented programming, add_action in constructor not firing
  88. add hook restricted only to either plugins or themes?
  89. Using actions, hooks and filters in a non-WordPress page
  90. addaction hook cause redirection problem
  91. Removing action from template class
  92. Which hook should I use for this scenario regarding the registration process and account/profile update?
  93. frontend show edit profile with selected custom options
  94. Redirect back to origin page after using get_delete_post_link()
  95. How do I override the user’s input when updating a custom post type’s permalink?
  96. How to add a new link to the default register form’s footer links?
  97. The acction hook stop working if i move it from plugin file to theme’s functions.php file
  98. admin_post hook not working
  99. How do I set a custom post type Category after import using wp_set_post_terms
  100. Hooks to trigger a callback when adding, removing, rearranging or updating a widget in the widget area