How to get changed post title in my custom plug-in which fires when ‘save_post’ is called?

The second argument of the save_post action contains the post data:

do_action('save_post', $post_ID, $post);

You can also hook post_updated which will let you easily compare the before/after data:

do_action( 'post_updated', $post_ID, $post_after, $post_before);

Related Posts:

  1. Difference Between Filter and Action Hooks?
  2. How to create an API for my plugin?
  3. How to add sub-menu to a menu generated by wp_nav_menu by using plugin
  4. Explanation of the “posts_join” and “posts_fields” filter hooks?
  5. How do you use the plugin boilerplate loader class to hook actions and filters?
  6. add_filter OO with parameters
  7. How Can I Add a Filter to Class Instance Only?
  8. Is it possible to remove next-post / previous-post with out creating a custom template?
  9. How to remove unwanted panels inside InspectorControls from core blocks in Gutenberg
  10. function triggered by “manage_users_custom_column” filter not working
  11. Proper way to use apply_filters() with class functions?
  12. add_filter and remove_filter added before and after wp_query
  13. Actions or filters fired when data is saved in a custom table
  14. Some nav-menu filters do nothing
  15. Filter on the_content ignores shortcodes
  16. Determine which theme location a wp_get_nav_menu_items is for
  17. How to change wordpress post title?
  18. What’s the difference between hooks, filters and actions? [duplicate]
  19. Conditional add_filter?
  20. Conflicting save_post functions when passing the post id and saving custom meta boxes for different post types
  21. Hook for post permalink update
  22. Dynamically Override Fancy Title
  23. Calling apply_filters on non-documented hooks
  24. WordPress Media mime type filter problem 4.0
  25. How to add custom content under plugin row in WordPress admin plugin list?
  26. Define a function outside a class and call the function using action or filter hook
  27. Does add_filter work outside functions.php
  28. Synchronize Custom post type tags to WordPress default posts tags
  29. save_post hook not triggered in WP v3.6.1
  30. Version upgrade: can my plugin filter the SQL statements issued during a database upgrade?
  31. Support auto-save and revisions for custom fields
  32. WordPress after content Hook & external template part
  33. Two functions utilizing registration_errors filter
  34. using new WP_Query in save_post function alters $post
  35. best practice for query string values – get_query_var always empty for my value supplied in query string
  36. get_current_screen() return null
  37. Problems with: manage_${post_type}_posts_columns
  38. How To Change Logout Screen Title
  39. Add code inside specific wordpress standard function
  40. Check for template part, else filter content
  41. Why doesn’t my simple the_title filter get applied?
  42. How to filter the_content() & include content from template
  43. Plugin with action ‘save_post’ needs to press publish twice on order to publish
  44. Strange issue saving custom field data for a WooCommerce order
  45. Adding rewrite rule dynamically
  46. Prefixing plugin hooks (actions/filters) with a wrapper class or functions
  47. Replace youtube embed in wordpress
  48. How can I replace content in the WP Admin area before an admin page is rendered?
  49. How to filter content for specific content variable
  50. Using ob_get_content to get_search_form puts into infinite loop
  51. Valid filenames for add_action’s first parameter
  52. How do I access the menus produced by Dashboard > Appearance > Menus
  53. WordPress class, using add_action to call member function does not work
  54. How to get all queries’s results after they have executed?
  55. Checked() function on a multidimensional array
  56. How to get the post excerpt using post object?
  57. hook filter after the_content on a specific page
  58. Bind a function with its own argument to show something dynamically after every content
  59. Hook add_attachment error
  60. Update variable value via add_filter
  61. Make wordpress join default user metas with a column from another table while displaying the wp_users table on the users screen
  62. Configure WordPress to Generate Scheme-less Relative URLs
  63. Gravity Forms Anchor only on Front Page?
  64. How to find list of all functions bind to a particular hook from my plugin?
  65. Adding filter to the title without affecting the menu title
  66. How to validate inputs with filter in register_setting callback
  67. How do i remove the title from a specific page
  68. Can / should a widget plugin define its own Widget Area?
  69. Can I attach a plugin via my add_filter callback contents?
  70. apply_filters() and call_user_func() to define and call a function outside a class
  71. add_filter postbox_classes multiple post types
  72. Is there a way to get rendered html content of a WP post after updating?
  73. Override category archive page title (not the head title)
  74. Limit get_next_post to posts from the same author
  75. Override woocommerce loop-start.php from theme using plugin?
  76. Any way, hook to add content right before the “read more” link?
  77. WordPress Plugin Boilerplate – add actions and/or filters based on user’s role
  78. login_message filter not working
  79. Add_action not calling callback function
  80. I have a plugin where in I have to change the title of the page dynamically by sending parameter to the_title filter
  81. WordPress Dropdown image select
  82. Saving post meta
  83. Modify search form with plugin
  84. Single_template for a custom post type created from a plugin is returning an empty page
  85. get_comment_meta() for a filter hook in a plugin
  86. Which filter to use to pre-parse form elements, which are generated by plugin’s shortcode?
  87. Custom signature appears twice on page
  88. Caption Shortcode: what filter to change the image size?
  89. Confusing $tag specification for apply_filters call, in core options.php code
  90. Hook for plugin to show content for certain urls
  91. How to filter get_adjacent_post()?
  92. post_results filter confused by pagination in sidebar and main section
  93. How do I replace title with my plugin?
  94. Apply Filters Causing a 500 Internal Server Error
  95. wp_mail_from not changing from address
  96. append code after the_content not working
  97. add_filter adds output in the head
  98. Apply function on all action hooks?
  99. Sanitize and Save metabox values
  100. Ninja Forms: Front-End Forms, Post ID?