using admin functions on frontend

Put the following line before using the function.

require_once( ABSPATH . '/wp-admin/includes/image.php' );

Related Posts:

  1. Creating a table in the admin-style?
  2. Change admin language based on user (in single-site)
  3. What is an alternative method to the WordPress private _doing_it_wrong() function
  4. Admin config screen without menu
  5. Make Categories and Tags required in admin
  6. function triggered by “manage_users_custom_column” filter not working
  7. How to add HTML / Form to an Admin Bar Menu
  8. WordPress plugin how to run function when button is clicked
  9. Shortcodes, output buffering, and WordPress functions
  10. How can i list current author’s categories?
  11. Error with Custom Admin Screen in iframe Thickbox
  12. WP_Error handles errors, but how can I show success with a message?
  13. When to check if a function exists
  14. Dynamically Override Fancy Title
  15. Problem with `wp_mail()`
  16. Calling a function from functions.php in custom page/ blog post
  17. What is the Difference between directly call a function and call a function using add_action?
  18. Call to undefined function get_blog_option()
  19. JS / JQuery form validation in backend admin menus
  20. How to put placeholder text in the main post input area?
  21. What is the difference between current_page_parent and current_page_ancestor?
  22. Plugin development: is adding empty index.php files necessary?
  23. Undefined function wp_set_password
  24. What does $_registered_pages do?
  25. Add tab to profile.php wordpress plugin development
  26. WordPress Ajax callback function from plugin – OOP
  27. How can I add a CSS rule to edit.php?
  28. wp_enqueue_script + wp_enqueue_style Since When
  29. Admin auto-refresh is interfering with Firebug — how to prevent it?
  30. Widget update function not saving values
  31. $content variable – Is this a reserved variable for a WordPress function? – php / wordpress
  32. How to use WP_Term with (menu) argument in the wp_nav_menu?
  33. WordPress after content Hook & external template part
  34. override pluggable.php functions
  35. Can I change header.php of current theme through a plugin function?
  36. maintaing consistent layout wordpress dashboard
  37. get_current_screen() return null
  38. Add column and post filter for a custom post type field on the edit.php page
  39. creating custom function to log actions in plugin
  40. Is there no admin ui guide for 4.x?
  41. Maximum lifetime for nonce
  42. Where can i find wordpress auto update code flows?
  43. Correct check for any admin page with editor
  44. Adding option to Gallery shortcode
  45. Admin Plugin POST to another file within the plugin
  46. How to change the hover content of a specific menu item on WordPress?
  47. How do I update a field of a meta box?
  48. Admin – Handle data before creating or updating a post, page or custom post
  49. How can I replace content in the WP Admin area before an admin page is rendered?
  50. mysql_real_escape_string() vs. esc_sql() in WordPress
  51. WordPress function get_the_terms() returns ‘Invalid taxonomy’ error
  52. Checking for existence of a page by title?
  53. how to get context information inside my funcion
  54. WordPress class, using add_action to call member function does not work
  55. How to Move the Comments Bubble to the Right Side of the Toolbar
  56. Does admin_print_scripts-$hook_suffix work for nested paths to individual files?
  57. wp_get_theme Warning: Illegal offset type
  58. Warning: call_user_func_array() expects parameter 1 to be a valid callback
  59. Print Dashboard submenu name and filename
  60. Autogenerate a Table of Contents
  61. WordPress multisite,use same cookies across all website?
  62. Call to undefined function is_home() or any conditional tags
  63. wp_schedule_event is registered but function isn’t running
  64. Disable Auto-Expanding Menu in WordPress Admin Menus
  65. Plugin Development – Get Admin Url (Including cases where wp-admin is not used)
  66. Remove Permalink Meta Box not working?
  67. Proper way to create an administration page without adding it to the menu
  68. Setting post_id for single.php based on URL without a redirect
  69. Javascript Function Called Too Early in PHP Script
  70. WP 3-way voting system: On to something! Please help!
  71. Custom Settings Plugin Save foreach checkboxes
  72. Change the behaviour of a button
  73. Add two button to page and post admin to redirect to : add new & list of (posts – pages) just after saving post or page
  74. Make visible page only in the trash
  75. Redirection from a specific page for users logged in but not with membership
  76. WordPress: I wanted to use Add rewrite rule multiple times for multiple CPT in my plugin
  77. WordPress Ajax not returning Response
  78. Remove tag from all posts when publishing new post
  79. How to create plugin settings page for each admin user?
  80. wp_ajax add_action fuction won’t fire on custom jQuery action
  81. foreach argument to get specific file types getting too many returns
  82. Remove from a div by class name from post page if post author role is not administrator
  83. Building WordPress Themes With Bootstrap with Adi Purdila → TutsPlus
  84. How to return a blank page
  85. Ajax not working to insert, query and result data
  86. Adding admin for specific users
  87. How do I control the list of Pages an author can see?
  88. Template file structure , wordpress hook for altering the template
  89. WordPress permalink setting
  90. How can I see a varibles value when my plugin runs?
  91. How can I add recent posts to menu like mashable
  92. Why is ‘register_activation_hook’ undefined?
  93. Dynamic banner for use on external sites
  94. How can i call from custom fields to the category editor?
  95. loop and in admin header problem
  96. Custom options page for themes
  97. Why does this fail: Disabling plugins enqueue_script() in functions.php
  98. Call do_action() within WordPress cronjob
  99. How to plugin function code move to theme function.php ? I’ve tried below code but not working [closed]
  100. WordPress simple ‘Hello World’ plugin – problems