post_type_exists keeps returning false

You must call register_post_type on each page load, when you register a post type it doesn’t modify the database it updates variables which only exist for that page load. If you don’t do this WordPress is unaware of that post type. Much the same way that you register settings pages and styles on every page load, WordPress doesn’t remember that you enqueued a stylesheet 5 pages ago, it needs to be told to load it.

It’s the same with post types and custom taxonomies. Even the default types of pages posts categories and tags are registered on each load.

As a side note, you should not flush rewrite rules on every page load, it’s an expensive operation and only needs to be done when things change, as rewrite rules are stored in the database.

Related Posts:

  1. Category as Class for Custom Post Type
  2. Add filter to wp_list_categories and query what type of taxonomy-terms it use?
  3. current-menu-item class for custom post type parent
  4. Adding class to featured image
  5. different post-class when template is loaded via ajax
  6. Is it possible to store Custom Post Type data in separate set of tables and still have wp_post class functionality?
  7. How to assign classes to all elements?
  8. How to change “post_class()” for a custom post type?
  9. Apply Post Class to Custom Post Type
  10. Add a class to post_class if more than one post shares same meta_value_num
  11. Correct way adding External classes to Custom Post type and output their methods to template
  12. Highlight a Post on archive page if it has a new comment?
  13. How do test if a post is a custom post type?
  14. Where to put my code: plugin or functions.php?
  15. What does this PHP function code mean? [closed]
  16. Remove slug from custom post type post URLs
  17. How to disable the single view for a custom post type?
  18. Custom post types, taxonomies, and permalinks
  19. Query all posts where a meta key does not exist
  20. How to create a permalink structure with custom taxonomies and custom post types like base-name/parent-tax/child-tax/custom-post-type-name
  21. How to get all taxonomies of a post type?
  22. How to sort the admin area of a WordPress custom post type by a custom field
  23. How to create a custom search for custom post type?
  24. Deregister custom post types
  25. Can I assign a template to a custom post type?
  26. Permalinks: custom post type -> custom taxonomy -> post
  27. Should I use custom post types or a custom database tables for plugin development?
  28. Enable revisions for custom post type
  29. Extending the search context in the admin list post screen
  30. How do I query a custom post type with a custom taxonomy?
  31. Adding a Custom Post Type into the menu screen
  32. Pagination not working with custom loop
  33. How to Add Tags to Custom Post Type?
  34. How come Featured Image isn’t showing up in my Custom Post Type?
  35. Custom Post Type URL Rewriting?
  36. Add category base to url in custom post type/taxonomy
  37. Include custom taxonomy term in search
  38. Is It Possible To Add Custom Post Type Menu As Another Custom Post Type Sub Menu
  39. Adding ‘menu order’ column to custom post type admin screen
  40. Capabilities and Custom Post Types
  41. Can the Next/Prev Post links be ordered by menu order or by a meta key?
  42. what is the correct way to compare dates in a WP query_posts meta_query
  43. Use register_post_type() to modify an existing post type
  44. Custom Taxonomy specific to a Custom Post type
  45. Renaming Custom Post Types and Taxonomies
  46. List all posts in custom post type by taxonomy
  47. Redeclare/Change Slug of a Plugin’s Custom Post Type
  48. Allow member to have access to custom post type only. Permission to only edit their own posts
  49. Mixing custom post type and taxonomy rewrite structures?
  50. Advanced search form with filters for custom taxonomies and custom fields
  51. Highlighting wp_nav_menu() Ancestor Class w/o Children in Nav Structure?
  52. Resolve a custom post type name vs. page permalink conflict (same slug)
  53. Get custom post_type’s archive URL
  54. Enable Gutenberg on custom post type
  55. Is there a way to get N number of WYSIWYG editors in a custom post type?
  56. Can multiple custom post types share a custom taxonomy?
  57. How to Add Custom Fields to a Custom Post Type?
  58. Hook for post and page load
  59. How to enqueue scripts on custom post add/edit pages?
  60. How to display value of custom fields in page
  61. Where are wordpress custom types stored?
  62. Using save_post to replace the post’s title
  63. Custom Post Type pages are “not found”
  64. Possible to hide Custom Post Type UI/Menu from specific User Roles?
  65. How do I safely change the name of a custom post type?
  66. Custom post type single page returns 404 error
  67. Change “Enter Title Here” help text on a custom post type
  68. Hide content box with Custom Post Type?
  69. Change the text on the Publish button
  70. WP REST API fetch posts from post type
  71. Remove taxonomy slug from a custom hierarchical taxonomy permalink
  72. Adding categories to custom post type in permalink
  73. Load a script just to custom post type in admin
  74. Display all posts in a custom post type, grouped by a custom taxonomy
  75. How do you use a CPT as the default home page?
  76. get_terms by custom post type
  77. single-{$post_type}-{slug}.php for custom post types
  78. How do you use orderby with meta_query in WordPress 3.1?
  79. Custom post type single-{custom}.php not working
  80. How to get custom post type post id from slug?
  81. Programmatically publish a post (custom post type) with custom fields
  82. How to Add a Sub Menu Page to a Custom Post Type?
  83. Prevent post from being published if custom fields not filled
  84. WP_Query Pagination on single-custom.php
  85. With Rest V2 (WP4.7) how does one restrict certain RESTFUL verbs?
  86. Remove Custom Taxonomy Metabox from Custom Post Type Screen
  87. Is it possible to remove WYSIWYG for a certain Custom Post Type?
  88. Multiple orderby values in WP_Query
  89. Placing a Custom Post Type Menu Above the Posts Menu Using menu_position?
  90. How do I get the permalink of a custom post type?
  91. Custom post type – order field
  92. How to remove custom post type archive
  93. Row actions for custom post types?
  94. How to set parent-child relationship between differents custom post types
  95. Style custom columns in admin panels (especially to adjust column cell widths)
  96. Get terms by taxonomy AND post_type
  97. Add Custom Fields to Custom Post Type RSS
  98. How to use a custom post type archive as front page?
  99. How do I create a relationship between two custom post types?
  100. Do I need a nonce field for every meta box I add to my custom post type admin?
Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)