Why does abstracting html from plugin code result in loss of access to wordpress functions?

Use plugin_dir_path() to include executable files. plugins_url() returns the web address, that’s not what you need.

<?php include(plugin_dir_path(__FILE__) . 'forms/admin_form.php') ?>

Related Posts:

  1. Include WP_Query in my own PHP file?
  2. Include a external PHP file into a WordPress Custom Template
  3. Include files in functions.php
  4. load/require specific php files for specific pages/templates/post types
  5. ob_get_clean returns empty string, ob_get_flush outputs string
  6. where to include a php file
  7. Include Class File in WordPress
  8. nowplaying.include.php Will Not Display Results
  9. integrating external php library into wordpress- the right way
  10. Change title and meta description in included page (not template)
  11. Can I change a variable in a content part while calling it?
  12. the_author() not working outside the loop
  13. How do I use the Simple HTML DOM Parser in plugin when other plugin already uses it?
  14. Put CSS inside a PHP file and include it the right way
  15. functions.php is being included twice, creating PHP fatal errors
  16. Custom theme: Alternatives to long list of ‘include’ in functions.php
  17. PHP help get_template_directory + PHP include
  18. code is skipping a div
  19. PHP include is only working in certain places in my custom WP theme
  20. Correct and safe way to include php content in my page
  21. What is the proper way to include a PHP framework into my theme?
  22. php include not working in custom page
  23. Post’s ID pattern?
  24. Using WP functions such as the_title() in an included php file
  25. What’s the best way to include PHP code in pages?
  26. How to include custom PHP file both in header and footer files
  27. Include a file that has a function in it
  28. How do I call an external php non WordPress class into functions.php?
  29. require get_template_directory() . ‘path/to-my/file.php’ BREAKS customize > themes functionality
  30. Before & After Content – After Content directly below Before Content when using require_once
  31. loading a php file to a specific page id
  32. How do I fetch a data from an external database into my wordpress homepage
  33. How do I fetch a data from an external database into my wordpress homepage
  34. PHP get_category() function redeclared
  35. How do I / Is it possible to execute an external PHP file / function inside WordPress?
  36. Include a php file that is above WP installation hierarchically?
  37. How can I include a file related to blog URL? Nothing seems to work
  38. WordPress blog set up
  39. Shortcode not passing variable to included file
  40. php “use” not working in template [closed]
  41. How to include a php file in every post and page [duplicate]
  42. Shortcode to include PHP file, pass various parameters to include?
  43. wordpress.org disallowing my plugin becuase of loading core files in cron cpanel file
  44. Should I use include(_once) or require(_once) for loading php-file with customizer settings?
  45. Sending the reset password link programatically
  46. How to change upload directory in wp_handle_upload
  47. Calculate percentage of post by category
  48. the_title() & the_content() are retrieving Post details inside a Page, after calling a shortcode
  49. register_rest_route regex option for base64 or alternate
  50. Woocommerce – How to get products which have a sale between 20% to 40%? [closed]
  51. Customized title tag for each page in pagination?
  52. Can is_page() be combined with a switch control structure?
  53. is it possible to force wordpress to always save thumbnails as ‘jpg’ not ‘png’
  54. Run a filter when a walker runs
  55. WordPress (3.9.1) MultiSite Permissions. Is chown the answer?
  56. have_posts() execution failure
  57. WordPress with php 5.5 and zend opcache
  58. my posts are saved as drafts
  59. How can I remove a function that has been added to wordpress with add_filter?
  60. Create a range slider to change font-size with different screens sizes in wordpress customizer api
  61. Are there security or other issues with changing PHP time limit and max input vars?
  62. How can I pass a custom/dynamic product to the Woocommerce cart?
  63. Adding Taxonomy Image to taxonomy loop [closed]
  64. Irregular TTFB and server wait time response
  65. Two menus show up
  66. How to determine if the sidebar is empty? Or not active?
  67. WordPress member notification
  68. Unset session variable on page reload / setup but exclude AJAX
  69. Create page with custom php script and fetched data
  70. How to show an entire post content and not also the excerpt?
  71. WordPress shortcode returns the data before
  72. Sort posts in a specific way
  73. How to hide post in WordPress
  74. The user can only see their own profile
  75. Hide a div when a custom field is empty
  76. Post meta select input, if statement
  77. Fatal Error wp-settings.php on line 119
  78. what does $options = get_option(‘test_theme’); do?
  79. WordPress url By country code?
  80. How to change basename url for wp-admin?
  81. Prevent header and footer from loading on specific pages with template or plugin
  82. Get taxonomy terms that share a common object property
  83. WordPress all php BUT index.php downloads instead of loads
  84. Trouble matching strings (titles) using wp_query
  85. Current WordPress Page Title as Search Parameter into A Tag
  86. Limit the number of characters/words in an excerpt for a related posts section
  87. Yoast Breadcrumbs Inject Multiple Levels
  88. Maximum file Upload
  89. Unzip_file causing Media file upload error
  90. Primary navigation menu with timed items from custom post type
  91. WooCommerce – Add Shipping class below each product in Shopping Cart page
  92. Escaping a Single Quote in str_replace for Nav Function
  93. Use fetch_feed(); Totally Outside of WordPress?
  94. widget: input the px value from user and use it as inline style in widget function
  95. Create a dynamic buddupress tab
  96. Problems with plugin that fetches data from database with ajax
  97. When I use rewind_post() it shows menu items in my loop
  98. How to create categories out of a list of words?
  99. Difference between php memory limit and wp memory limit?
  100. Custom Post Type doesn’t have template content when creating programmatically in PHP but does when created in WP Admin