Does WordPress function replace_hello() exists?

This is custom function the author uses to show how to use the_content filter. If you look at the line after the function add_filter('the_content', 'replace_hello');
this is saying to call the custom function replace_hello when encountering the the_content filter

Related Posts:

  1. How to add a data attribute to a WordPress menu item
  2. Order posts (across the whole site) by metadata date
  3. Relative URLs and hide /wp-content/themes/
  4. Disable visual editor on one specific page
  5. How to display random users with avatars
  6. Can the wp-plugins (Must Use Plugins) URL be targeted for use in functions.php?
  7. In a WordPress plugin, how do you output HTML code inside the DOM header? [closed]
  8. Slugs as breadcrumbs for Pages
  9. Different ‘WP_CONTENT_URL’ for different subsites in Multisite setup?
  10. Removing Unnecessary Text from Admin Menu without CSS
  11. Display WordPress Search
  12. Remove_filter (‘the_content’, ‘wpautop’) is not working
  13. Preferred Use of home_url()?
  14. Where does function_exists() look to decide whether a function exists? [closed]
  15. Get page slug and assign a variable within functions.php
  16. Clean-up script tags
  17. Make “sidebar template” the default template for new pages
  18. Refactor create_function
  19. WordPress function for 1 to for many
  20. Logic to Print/echo a css class only for 1st post and ignore all post after 1st? [closed]
  21. Attach parent category template to all subcategories
  22. How to insert a text in all pages and posts before or after specific places?
  23. Add class or ID to any WordPress function
  24. How can you limit srcset on a single type of page?
  25. Remove Font-Awesome MaxCDN Link & Load Locally
  26. How to remove howdy dropdown menu content
  27. Change Admin Bar “Visit Site” URL
  28. exclude a category from a search on a specific page
  29. How to fix Warning: call_user_func_array()?
  30. Stop turning small dashes into longer ones
  31. How to get specified parent page title in my function
  32. Execute function after a post has been published
  33. Last updated date function
  34. Possible to display shortcode based on the category?
  35. I want to get product attirbute in the section below
  36. is_customize_preview() like function to check if Customizer “Live Preview” in JavaScript
  37. How to set default archive image without overriding first attached image? [closed]
  38. Passing a variable via wp_head and then calling it on the page
  39. Load Woocommerce and WordPress Functions Outside
  40. How to make custom column Admin>Users sortable?
  41. How to know which ajax file or function is called for action
  42. Full page template function
  43. Redirect from “private” page and functions.php which tag add to add_action()?
  44. Display gallery on bottom after content
  45. watermarking gallery items
  46. WordPress Shortcode function display outside of widget
  47. Get rid of the widget Item Class=”widget-item”
  48. Storing password (functions.php)
  49. Check if the image size is available and if not use ‘full’ image size
  50. Change menu based on page template via functions.php
  51. wp_enqueue_script | Help me figure out what is causing jQuery is not defined
  52. Why is it so hard to add a class to the tag in the sidebar widget?
  53. Parent theme styles overriding child theme CSS [closed]
  54. Adding theme option values as custom body class
  55. How to add a new image size and apply it to posts only?
  56. What is the correct way to include my new functions and scripts in WordPress?
  57. Perform function on publish AND save (not just save)
  58. add_menu_page() with variable function
  59. include w_thumbnail_src in function?
  60. Multiple, Dynamic, Sidebars Problem – First Sidebar not working properly
  61. How to add or delete default value theme options while activate and deactivate theme
  62. Custom blog post summary on blog index page
  63. Pass URL to iframe in WordPress Block
  64. How do I make the comment disappear after deleting from the database?
  65. Ajax Form Issues using Lightsail (AWS)
  66. External api call and make global variable for any page visitor enters , page-home, page, single etc
  67. WP AJAX Request Not Working
  68. Unable to login after registration
  69. Remove the ‘category’ url for one category type
  70. CSS style and app.js not loading
  71. blank page with wp_get_attachment
  72. Parent category as WOOCommerce Categories widget title
  73. Problem with my footer after changing WooCommerce Products Sorting [closed]
  74. Limiting WordPress Search function : Custom build
  75. Altering page / category names in breadcumbs
  76. Change user role based on total number of items ordered
  77. Function stops working
  78. Including admin-options.php file in Child Themes
  79. Rewrite rules and the permalink
  80. Custom taxonomy check box now showing up
  81. Set display name from nickname with register process
  82. how to display featured image for single post for a specific category
  83. Database Query not working
  84. Load a Child Theme’s style.css just before the closing tag
  85. Can’t wrap my head around this function – any help would be appreciated
  86. Figure inlined width trigger distorted layout
  87. save_post hook – headers already sent?
  88. Exclude javascript in certain page url and all following url’s after forward slash
  89. How to use WP_rewrite?
  90. Wp get archive only text not link
  91. can not call functions in function.php
  92. How to test for a class (from a plugin) in functions.php
  93. Child Theme not working – CSS gone
  94. Custom shortcode not being included in content paragraph [duplicate]
  95. Display post_meta-by_key on product catalogue
  96. What are the parameters are used in add_action and filters?
  97. Which template file to edit to edit homepage in Mystile [closed]
  98. Does functions.php apply to every page?
  99. Setcookie not setting cookies anywhere except admin
  100. WooCommerce, change “Add to Cart” to “Link to Product”, only for specific categories