What is the difference between update_post_meta and update_postmeta hooks?

They were both introduced in version 2.9, but were done so in different files.

update_postmeta went into /wp-admin/includes/post.php

While…

update_{$meta_type}_meta went into /wp-includes/meta.php

It was only later that update_postmeta was shifted into /wp-includes/meta.php.

So I believe it was for backward compatability, where by because the update_postmeta hook was always receiving the value of maybe_serialize() then it should continue to do so, despite later being moved into /wp-includes/meta.php.

Furthermore, which you may already know, but for the sake of others reading, the update_postmeta hook returns data from the $_POST['meta'] superglobal and key which holds data from the custom fields panel.

Could this just have been a poor design decision? Looks like it.

I thought I recalled some other reason surrounding this very question in relation to double serialization of data, however I could be getting mixed up with something else.

Interestingly, if you store already serialized data in the Custom Field UI textarea, WordPress will serialize it again before storing it, which supports the notion of backward compatability in relation to:

Note: this answer is not neccessarily complete.

Related Posts:

  1. How to hook update_post_meta and delete_post_meta?
  2. Does anyone have a visual breakdown of core hooks and when they are fired?
  3. Access post meta just after publishing
  4. Update post meta using pending_to_publish hook
  5. get_post_metadata causing some meta data to fail
  6. How to stop WordPress from updating the post meta
  7. Custom posts and get_post_meta in {$post_status}_{$post_type}
  8. Post via wp-admin and via iOS app, same hooks and triggers involved?
  9. Why does get_post() not return anything?
  10. Access post meta just after publishing
  11. Function is Missing an Action Hook
  12. Where can I find a list of WordPress hooks?
  13. Whats worth using add_action when we can simply use add_filter?
  14. add_action(‘wp_ajax_[action name]’, myfunction) problem
  15. Which hook if user profile information is updated?
  16. Are hooks called synchronously?
  17. Disable block from editor based on post type
  18. Difference between hooks Plugin_loaded and admin_int?
  19. Hook/notify when any option or setting is added or updated
  20. Which hooks is this? add_action(‘wp’,
  21. Make W3 Total Cache “Empty All Caches” function purge varnish [closed]
  22. admin_notices after register_uninstall / deactivate_hook
  23. How to inject content after
  24. Better post meta efficiency?
  25. How to debug removal of rewrite rule flushing?
  26. function ‘wp_enable_block_templates’ not found
  27. How can I add a default description to uploaded files?
  28. Hook Widget to Woo Theme in functions.php
  29. Security around save_post hook
  30. How to pass arguments to add_action() [duplicate]
  31. How to use the post_updated hook before and after arguments
  32. What is the best filter where to use register_block_type?
  33. Check if do_action(‘custom_action’) is hooked into?
  34. I don’t understand why I shoud use lostpassword_url hook?
  35. How to get session token of current user in wp_login hook?
  36. wp_login Action hook with conditional tag
  37. Hook any php file into the wordpress api
  38. WP CLI Get all Enqueued Scripts and Styles
  39. Delay an action until current action is completed
  40. How to properly setup an activation hook
  41. How to remove scripts/style added to customize_controls_enqueue_scripts hook by current active theme
  42. Help to change the text for new website notification (wpmu_welcome_notification)
  43. How to remove query string from current page URL?
  44. Plugins rewrite rules the right way
  45. Strange behaviour with add_{$meta_type}_metadata | add_post_metadata filter
  46. Plugin init hook
  47. Show notice just below the search form on the themes page
  48. Add nofollow to custom widget posts
  49. Change Password Confirmed Email Text
  50. How to check post type when using sanitize_title hook?
  51. Duplicate Cron Jobs Using wp_next_scheduled / wp_schedule_event
  52. Register form: add custom field BEFORE default fields
  53. Custom Front End Registration – How Does the Key work in the Password Set Request?
  54. How to change the default mail when admin approuved an user?
  55. Lock user information once fields have been filled in
  56. How do I prevent term from being created on create_term hook?
  57. save_post hook to add terms getting deleted when using bulk edit
  58. Hook function prints output twice
  59. Hook priority in admin with custom plugin
  60. Add Different Actions To Different Page’s wp_footer
  61. Getting the post ID in parse_query
  62. Remove genesis_404 hook from genesis_loop [closed]
  63. What hooks do I need to hook into to capture ever wp_user creation/change?
  64. Is there a before_save_post hook or something similar
  65. Add a custom class to the body tag using custom fields
  66. Neccessary to call add_submenu_page and add_menu_page from admin_menu hook?
  67. Adding custom Bulk Actions
  68. Print results of a WP_Query to wp-admin/upload.php within ‘delete_attachment’ hook?
  69. upgrader_process_complete filter not fired using ajax updates
  70. Is there a way to Insert a post to post list?
  71. How to call do_action() to pass arguments to hooked functions that take different number of args?
  72. WP hook to add custom content after the_title()
  73. Is it likely that do_action will have unexpected results?
  74. How to export category name and category link in wordpress json
  75. Error later wordpress 5.3.2 update. Please help
  76. How to abort a save operation with a WordPress hook?
  77. wp_get_current_user Not working
  78. is_page not triggering
  79. admin_post_(action) hook create console log error
  80. Check if front page within function passed to action
  81. Hook after creating a post and retrieve infos from this post immediatly
  82. Display custom debug info inside page and not before head
  83. $new_pass always returns null – password_reset hook
  84. How to resolve 500 error in post listing page?
  85. Object oriented programming, add_action in constructor not firing
  86. change attachment custom field onChange event
  87. Get new (not old) post inside transition_post_status hook
  88. How to Show Different Information to your authors/contributers
  89. Cannot override hooks.php
  90. Removing action from template class
  91. Remove “enqueued” script from array
  92. How to access variables in the function where apply_filters() is called?
  93. How to change Akismet commenter privacy notice?
  94. How To Apply Different Styles To All Blocks Based on Post Meta Value?
  95. PHP Notice: wp_enqueue_script was called incorrectly. Scripts and styles should not be registered
  96. getSaveContent.extraProps hook for core/post-title doesn’t add new attributes on to the frontend
  97. WP: Override/update the_content from database with the publicly echo the_content
  98. What is the equivalent hook for both admin_head() and wp_head() combined, if any?
  99. Search WordPress Hook for completed Elementor Update
  100. How to filter the URL of thumbnail size in the Media Grid and admin pages

Leave a Comment

techhipbettruvabetnorabahisbahis forumutaraftarium24eduseduedusedueduseduseduseduseduedus