WordPress functions give fatal error in included php file

You’re POSTing the form to the validate.php file directly, so the WordPress code isn’t loaded. Instead you need to POST the form to the current URL or the home_url or something like that, and then have the plugin intercept the data and act accordingly, so that the WordPress code is loaded before you use its functions.

Related Posts:

  1. Redesigning Custom Post Type “Add New” page
  2. Can we hook a static method of a class to add_action inside that class?
  3. How can I remove a hooked action created by a plugin?
  4. How can I add a custom header to a custom template in a plugin without using the theme folders
  5. Twillio How To Send SMS for Custom Post Type
  6. Woocommerce category description as subtitle
  7. Custom values are not translated
  8. Change the name of an installed plugin
  9. WP deregister, register and enqueue dequeue
  10. prefix table and plugins
  11. Remove action from a plugin class, forced to use global instance
  12. Duplicate a Multi-Site Subdomain
  13. why in my wordpress admin panel the membership option is not showing
  14. What Plugin Do You Use to Turn WordPress based site to A Blog Aggregator
  15. Sanitizing, Validating and Escaping in WordPress (Plugin)
  16. Error uploading plugin zip file
  17. Avoiding Duplicate function names in Post Loop (WP_Footer script)
  18. How to add page using HTML, CSS and JS?
  19. problems with wordpress and php version 5.3.3-1
  20. My Category is too big on the Menu what can i do?
  21. Integrating non-WooCommerce and WooCommerce Orders together [closed]
  22. Hook to plugins admin settings
  23. Fusion Slider Just keeps loading [closed]
  24. how to change the verification url of pie register plugin of wordpress?
  25. (WooCommerce) Remove Sidebar only on Single-Product page
  26. Own plugin corrups plugin-activation
  27. stack-overflow-like content ranking for wordpress?
  28. finding whether request is for post, and post id
  29. How to fetch products with the price in a page on woocommerce using a form or live search with php
  30. Owl Carousel2 image not displaying full width when using Stretch row and content, Stretch row and content(no padding) in wordpress
  31. WpDataTables – View Image Directory
  32. Masonry images not working
  33. How to block XML-RPC attack?
  34. How generate 200% image size and save with suffix @2x
  35. Force language in translate function
  36. Using color picker in plugin, does input attribute order matter?
  37. Can’t send mails wordpress using SMTP authenticate [closed]
  38. Some recent plugin updates have failed “Could not create directory”
  39. How do I apply style to each category of a list?
  40. How do I combine a theme with a plugin
  41. Use wp-config.php constants in all files of plugin
  42. a href adds default URL with the given echo URL
  43. How to track clicks
  44. How to install Google Analytics onto site without internet access
  45. WP.org acceptable iframe alternative
  46. Access post title from custom meta box on title change
  47. Add to array, redirect and display
  48. how do I secure my WP website from hackers? [closed]
  49. How to add a WordPress Nonce for this form to avoid CSRF
  50. Function call in wordpress short code handler fails
  51. Overriding current theme files via plugin
  52. How to create a plugin that includes all the other plugins?
  53. Mowing site to another domain in simplest way
  54. ACF – How to set the menu order for the relationship field
  55. Passing PHP Variables to AJAX Loaded Pages
  56. How to check for completeness when upgrading fails and stuck in maintenance mode
  57. Remove border attribute from Pin It Button image to pass HTML5 validation [closed]
  58. Manage PDF downloads and protected pages
  59. How to restrict a plugin from certain pages without editing its core
  60. Hooks to run after a core upgrade?
  61. How do I override all stylesheets and scripts without a plugin
  62. How to permanently show Word Counter on Create/Edit Page. WordPress5.9.3
  63. how to move a plugin-block in Edit Post page back to bottom area?
  64. How to change my 3000 Published post status to Draft using PHPMyAdmin
  65. Show popup on click
  66. Search results to point to specific section?
  67. Adding an item to an anonymous array inside a filter?
  68. add menu page not showing Icon
  69. Make custom post types using ACF
  70. Using id to show item
  71. One quantity for group of variations
  72. WP Migrate DB Pro plugin cannot transfer Media files to remote server
  73. Shortcode and WP query using category attributes
  74. URL Rewrite 404
  75. Plugin for showing single product on a page
  76. Is admin section completely customizable in terms of styling?
  77. Custom Gallery plugin uploading to different dir, and post to page
  78. Better way to run heavy scripts using WordPress database
  79. Taxonomy question
  80. What’s a good way to default behavior if a plugin is inactive?
  81. how to check plugin name unique or not?
  82. Pause form submissions while upgrading plugins
  83. How do I locate specific part of code that affects ssl?
  84. Render Shortcode in Lightbox Gallery
  85. Redirect login url
  86. Disable plugin on admin page
  87. WordPress ajax not working in registration
  88. Publish Post but don’t call publish hook in foreground post creation
  89. WordPress Overrides folder permissions in Cpanel
  90. Replace code in plugin template
  91. Setting META tags such as description and title on programmatic post creation
  92. How to Set Limit with WordPress Get Bookmarks Shortcode
  93. making users able to add their own products wp e-commerce [closed]
  94. Selling Downloadable Products [closed]
  95. ACF: Hide a div or template section when a custom field (in a field group) is empty
  96. TypeErrors with Yoast, jQuery in conflict?
  97. Adding a variable to a meta field in the backend?
  98. Creating a Table Row by Row
  99. Getting 504 Gateway Timeout Error on AWS Server! [closed]
  100. WordPress issue – data is not showing in wp-admin, but when searching through database, all the data is there
tech