What are the parameters are used in add_action and filters?

From Codex:

Usage

add_action( $hook, $function_to_add, $priority, $accepted_args );

Parameters

$hook

(string) (required) The name of the action to which $function_to_add is hooked. (See Plugin API/Action Reference for a list of action hooks). Can also be the name of an action inside a theme or plugin file, or the special tag “all”, in which case the function will be called for all hooks)

Default: None

$function_to_add

(callback) (required) The name of the function you wish to be hooked. Note: Only string-formatted syntaxes listed in the PHP documentation for the ‘callback’ type are valid.

Default: None

$priority

(int) (optional) Used to specify the order in which the functions associated with a particular action are executed. Lower numbers correspond with earlier execution, and functions with the same priority are executed in the order in which they were added to the action.

Default: 10

$accepted_args

(int) (optional) The number of arguments the hooked function accepts. In WordPress 1.5.1+, hooked functions can take extra arguments that are set when the matching do_action() or apply_filters() call is run. For example, the action comment_id_not_found will pass any functions that hook onto it the ID of the requested comment.

Default: 1

Related Posts:

  1. Trying to use add_action and do_action with parameters
  2. How do I pass arguments for multiple functions hooked to a single action?
  3. How to return hook data when multiple parameters are present?
  4. Warning at top of website & top menu gone
  5. Set URL Parameter Post Layout As Default
  6. wp_upload_bits – define (sub)folder / (sub)directory before filename?
  7. Why use if function_exists?
  8. What’s the difference between esc_html, esc_attr, esc_html_e, and so on?
  9. Include files in child theme functions file
  10. Check if post is being published for the first time, or is an already published post being updated
  11. How to get woocommerce inventory status [closed]
  12. Is there a hook or function I can use to display all theme files being used on a current page?
  13. Implementing DNS Prefetching with WordPress
  14. How can I remove the title “leave a reply” in the comment box in twentyeleven?
  15. Why do I get Fatal error: Call to undefined function get_most_recent_post_of_user()?
  16. Login using the password from protected pages
  17. Enqueuing External Javascript functions.php
  18. Function to wrap the_content in a div
  19. How to run a function once on every post in database?
  20. Checked() showing up twice in custom fields
  21. Date/time limitation of posts where function must be executed
  22. Custom image size in Media Dropdown
  23. Gravity Forms field entries into wp_query loop [closed]
  24. Remove the deleted users avatar from list
  25. Update Content based on expiration time or queued processing
  26. How to filter a table in post content without plugins? [closed]
  27. Adding to fontawesome-webfont.woff2 to boost website speed
  28. How to enable template page only for a post id page
  29. Having issues with a foreach inside of a shortcode with ACF gallery
  30. Remove after images
  31. Is there an alternative to get_template_directory_uri()?
  32. Word Press – Dynamic Content [closed]
  33. Change label for registration Fields
  34. Get First Child Page ID or Permalink in WordPress Admin
  35. Footer disappears when using the_content ( )
  36. Get page id or status by private pages?
  37. Categories as main menu items and subcategories as nested lists
  38. woocommerce change currency per category [closed]
  39. Using wp_redirect and .htaccess to re-route searches (and pass along the remaining GET vars)
  40. How to override woocommerce.css?
  41. Connecting to a 2nd DB gives me no results when querying
  42. Including php files within template
  43. Author Date Function not working as expected [duplicate]
  44. Add_filter when value is no variable?
  45. The Loop not looping?
  46. I can’t seem to install Font Awesome locally [closed]
  47. laoding bloginfo url in function array?
  48. New custom menu created. how to apply it?
  49. problem loading stylesheets to wp_head dynamically
  50. Use Composer Package inside class – Namespacing error
  51. Add a field into a shortcode of an extension
  52. Update to functions.php not showing in dashboard
  53. Unable to point the child theme directory even using get_stylesheet_directory()
  54. Need a method to prevent WP from adding in between my shortcodes
  55. How to edit/replace Parent functions.php function in Child Theme to add “Walker” class
  56. Change WooCommerce add_to_cart Button Text?
  57. How to modify get_the_excerpt() when post-format equals ‘quote’?
  58. wp_get_attachment_image_src returns image on main domain, false on subdomain
  59. Get the alphabetical sorted data with wpdb
  60. New checkbox in custom widget isn’t saving data
  61. WordPress Check User Role Function (multiple roles)?
  62. Post to category based on email domain, for a post-by-email plugin
  63. struggling with syntax for the_post_thumbnail();
  64. Echo youtube code from url or shortcode
  65. Add custom taxonomy using JS in post editor
  66. WordPress: Highlight search result exact matches
  67. Woocommerce Default sorting product by product type
  68. Displaying registered sidebar after post content
  69. Adding custom social icons to the social media icon block in the Gutenberg editor?
  70. Allow user select role in wordpress default registration without plugin
  71. Display link to category over featured image
  72. Does hook have an effect on increasing the page load?
  73. Adding a schema code to one specific page using functions.php file
  74. Multiples functions on customize_register?
  75. search and replace using regex
  76. post value to function with Ajax and jQuery
  77. price of product can’t return when get data of product in functions.php
  78. Re-style Login Form Whilst Keeping CSS Separate from Frontend CSS
  79. Can You Set A Minimum Image Dimension For Resizing Images?
  80. (Divi): How to make WordPress load images of specific size for Blurb modules on given page with a funciton?
  81. Strip all HTML tags from product content and resave
  82. Calling hooks in functions
  83. Creating a “Related Meta” type field?
  84. Shortcode with pagination advancing multiple queries
  85. How to add custom column into custom post, when field is select
  86. How to add widget in main menu
  87. Function image_send_to_editor returns emty title tag
  88. Modified functions.php in Magazine Pro theme of Genesis. 500 error
  89. Integrate WP Tiles into existing loop (index.php) and theme
  90. Update functions.php from WordPress dashboard
  91. How to Add A Rel Filter to All Links?
  92. Show latest custom post types on dashboard
  93. Using conditionals, maybe from a DB, to register & enqueue files, for varying pages, in functions.php
  94. Function working in single.php but not working in custom template file
  95. Add function to add element on all page
  96. child_of not working while searching
  97. Function in functions.php by url
  98. Adding a filter to my posts
  99. Custom Post Type Search
  100. sort by date in users