how can I register a post_meta field in an existing CPT and then call it again with get_post_custom()?

It’ll probably be way easier to just use https://wordpress.org/plugins/advanced-custom-fields/

If not check out this post which points you to this page

Related Posts:

  1. Query all posts where a meta key does not exist
  2. what is the correct way to compare dates in a WP query_posts meta_query
  3. Correctly delete posts with meta and attachments [duplicate]
  4. Admin Area Custom Type Search By Meta Fields Without Title & Content
  5. How can I filter posts by post_parent in the admin?
  6. How to create a mini directory in WordPress?
  7. Detect meta value changes when post is updated (post_updated)
  8. Search everything (posts, pages, tags, cpt, meta)
  9. Permalinks using event date (year & month) instead of publication date
  10. Compare 3 custom fields and sort by oldest
  11. Reason action hook won’t work with update_post_meta from frontend form? Alternative?
  12. Can’t sort order of wp_query with 2 meta keys
  13. How to get source of custom meta image?
  14. update a post meta from a single table cell TablePress
  15. update custom post type meta from a shortcode
  16. Custom Meta Boxes – Nonce Issue – Move to trash issue
  17. Displaying Meta Box Image
  18. Show metabox in custom-post-template depending on taxonomy term?
  19. ACF Upload Image in repeater from front-end with custom form? – add_post_meta()
  20. Displaying custom posts only if custom meta box’s date is not expired
  21. Displaying Metabox value (custom post type taxonomy)
  22. get_post_meta is returning image id
  23. Custom Post Type, Saving Multiple Checkboxes
  24. get_template_part() – post-meta not working?
  25. Create a random unique 6 digit number as custom field for custom post type
  26. Export entries and multiple custom field meta to .csv?
  27. Metadata for a taxonomy – is there any WordPress way of doing this?
  28. Update CPT post meta with update_post_meta and cron job
  29. Insert post metadata for all posts in CPT at once if metadata no existent
  30. Display custom post type from dynamic custom field
  31. Populate dropdown from one custom post type inside another custom post type
  32. Get posts between custom dates
  33. A better way to add a meta box to custom post types
  34. Should wp_postmeta meta_key always be unique for a given post_id?
  35. How do I set all of a particular post meta to a value within the custom post type I’m in?
  36. Metabox not show in categories custom post type cmb2
  37. Storing a many to many post type relationship in post meta and keeping SQL ability for Joins
  38. Custom fields for custom post type
  39. Show future events based on custom field AND order by date
  40. If Post Meta Equals Current Title Conditional Advanced Custom Fields
  41. create custom meta box with default value
  42. How to Echo Metadata Value in Currency Format
  43. Issue on Working with Metabox – Checkbox to enable Sale Items
  44. delete_post_meta() for whole CPT / multiple posts?
  45. How to move a post to different post type with all meta data?
  46. Why do I have to press the “Update” button twice to save my meta box values?
  47. WP API Response does not show my registered metadata
  48. How to detect that the save_post hook is calling the callback associated to the current edit post page only
  49. get_post_meta returns NULL in front-end, but correct result in back-end
  50. Problem with adding custom post type meta to header by plugin
  51. Meta box data is saved but NOT displayed in the meta box text field. Why?
  52. How to call a post’s metadata in shortcode.php?
  53. Echo custom post meta from options array
  54. Value of post meta dropdown is not showing in WordPress
  55. WP_Meta_Query object with conditionals
  56. Trying to write shortcode with get_post_meta but isn’t working
  57. HM CMB: Post Select Field for CPT ID
  58. updating one custom meta field only
  59. Add a class to post_class if more than one post shares same meta_value_num
  60. Problem Saving Custom Post Type Meta Values
  61. Need help with Custom Post Types and Taxonomies
  62. Should I use a custom taxonomy or custom post type for grouping a list of panels associated with a group of tests?
  63. Add a form in every post and save data in post meta
  64. How can I add a meta[] to my custom post type and search by term with the Rest API?
  65. Show posts from WP Custom Post Type selected from a field in a metabox
  66. Creating an archive page or simple template to list all values of a custom field of specific post type listing
  67. Peepso: Add extra data field (custom post meta) to postbox
  68. Change picture attachment meta of all occurrences of a picture
  69. Unknown Post Meta Records
  70. Get Previous Post based on Custom Field Name, for Custom Post Type
  71. Saving custom post types post_meta over REST-API fails
  72. add action save post type and update post meta woocommerce
  73. How to Disable option of meta field if that option is selected for any other post in custom post type?
  74. get_post_meta not working with variable as a post_id for dynamically get the postid
  75. wordpress does not see the correct custom taxonomy hierarchy
  76. Is there a way to re-order the Custom Taxonomy drop-down on a Custom Post listing page?
  77. Add more custom fields when creating a new custom post type
  78. Stripe multiple transactions
  79. How to get Current week and current date record wp query
  80. Edit is changing my custom’s post type parent id
  81. Disable Facebook Comments Automatically On CPT
  82. How to add post reference field to a plugin?
  83. Problem with ‘save_post’ hook not running
  84. WordPress custom post type
  85. Edit post meta direct from post.php?
  86. Howto: use existing post_meta as options for a different metabox (checkboxes or list)
  87. Custom Post Type meta oembed html output resulting in WSoD
  88. Timetable of Custom Meta Data using Custom Post Type and Custom Taxonomy
  89. Change the contents of a dropdown through the admin panel?
  90. Top 30 Songs using Custom Post Type
  91. Advice Needed for Post Meta Database Efficiency
  92. fetch meta fields inside a widget
  93. Custom post type – update_meta not working
  94. Single and Archive Pages with Custom Post Type
  95. Separating a custom taxonomy from blog post-type
  96. Use a Variable in update_post_meta as the $meta_key
  97. Update an existing post in a custom post type
  98. getEntityRecords/useEntityRecords: How to use CPT metadata?
  99. CPT meta values intermittently return empty
  100. How to display custom taxonomy subpage inside wp menu from a custom post type using add_menu_page() and add_submenu_page?