add custom metabox to media library custom widget

It looks that a reference to global $post; is missing at the beginning of your function widget(){}

Related Posts:

  1. I can’t fetch query parameters ($_GET parameters) with get_query_var
  2. Change Password Hint
  3. Dynamic URL to reference custom PHP files
  4. Prevent multiple counts by same user – WP PostViews plugin
  5. Second select list values are not saved after clicking update
  6. Use wc_enqueue_js only on specific pages – nested add_action
  7. How to use a frontend URL with a Plugin
  8. WordPress template_include filter not working properly
  9. Theme url in all plugin pages
  10. “The plugin generated 2694 characters of unexpected output…” on Plugin activation, CREATE TABLE sql command not working
  11. How to display a value from a radio button in the options menu in wordpress
  12. Why WordPress architecture is not pure object oriented and it don’t use MVC pattern? [closed]
  13. How to access function from outside of a class within this class in WP plugin?
  14. How can i display post loop in table format?
  15. PHP can I add line numbers to file_get_contents()
  16. How to call function at the bottom of post using plugin?
  17. WP add_action factory
  18. Swapping wp_dropdown_categories function with wp_category_checklist
  19. How to show phpinfo() only in a new tab?
  20. How can I remove a function that has been added to wordpress with add_filter?
  21. what is the best practice to add new field to an api route
  22. Use custom post type for a store locator
  23. How do I programmatically set a user as spam in BuddyPress? [closed]
  24. How to use $_GET function WordPress backend
  25. WP CRON duplicate wp_insert_post with has < and > tag
  26. How to send Ajax request from my plugin in admin dashboard?
  27. Extend PHP regex to cover “srcset” and “style” attributes
  28. AJAX success response is not working but it’s saving my changes
  29. Best practice for show data to one specific user?
  30. How can I hide that I Use WordPress (with W3 Total Cache)
  31. Saving plugin settings – ERROR: options page not found
  32. class_exists returns different values [closed]
  33. Can’t print Yoast meta description into page template (syntax error, unexpected ‘.’) [closed]
  34. Asynchronous multiple requests 401 Unauthorized
  35. Custom array from a query only write the last row of the query
  36. Using data sent via AJAX in multiple functions on a WP plugin
  37. Is it possible to define variables in a wordpress shortcode, and then call the shortcode using a specific variable?
  38. Change product_base programmatically
  39. How to remove the message ‘We could not find any results for your search’ without changing template files and without adding posts/pages?
  40. How to add the sidebar to all the pages except the home page? [closed]
  41. Custom meta box values are not getting saved for my custom post type
  42. WordPress shortcode returns the data before
  43. Plugin development and composer
  44. Can’t upload CSV file to plugin directory using custom upload form in admin panel
  45. Validate and Sanitize WP REST API Request using WP JSON Schema?
  46. Set default Database Storage Engine when creating tables with plugins?
  47. custom post type with role Vendor
  48. Can I remove or edit an include() from a function with a filter?
  49. Call to undefined function error in plugin
  50. How do I make this Metabox show current DB value?
  51. Execute Jquery when a specific page in my plugin is loading
  52. Get category id when SEO URL is turned on
  53. Ajax on the Administration Side of plugin – wp_localize_script – how to pass value from JQuery to PHP function in class?
  54. Using ACF Relationship field to set post type to draft or published status
  55. How to extend SelectControl with data from my theme
  56. How to change basename url for wp-admin?
  57. Only the first image uploads
  58. Illegal string offset checkbox
  59. Custom plugin: how do I call a PHP file if settings option is set to true?
  60. Trying to use a variable to set image width
  61. How can i avoid duplicate same post in wp?
  62. How do I disable cache for a certain page?
  63. How to check if plugin update process completed in wordpress?
  64. How to identify which php file a plugin is using on page load?
  65. dashboard widget form not submit mails
  66. How to import woocommerce custom fields data into another site?
  67. Add a custom link to each image in WordPress gallery
  68. How to access this jQuery/AJAX data in a PHP file/WordPress plugin
  69. post_exists stops working in a scheduled event
  70. register dependency css and js inside a plugin class
  71. When I create a new custom post type, it replaces the old post type
  72. How does one make a URL return dynamic JSON with custom Content Type?
  73. How to give custom roles the capability to edit one Menu instead of every Menu
  74. add menu page in loop menu order
  75. Add .php to end of all WordPress Pages (multisite)
  76. defined (‘ABSPATH’) false after AJAX post to other PHP-file
  77. PHP get_category() function redeclared
  78. Getting Member Data From WhishList Member on Register
  79. Private messaging – Getting and displaying the avatar/url of a message recipient
  80. I’m writing my first plugin and my echo output is showing up on every page of my wordpress installation
  81. global $post inside plugin query messes up every new post page in wp-admin
  82. widget: input the px value from user and use it as inline style in widget function
  83. PHP calling function within a class
  84. Custom post type single page return to listing page
  85. Save data of select list after clicking save
  86. Create and update Custom Cookie based on multiple GET and POST Values for first time visitors?
  87. WordPress rewrite question
  88. Using Nonce for my Form
  89. Create new folder and upload files to custom folder via wp_handle_upload
  90. Can’t remove menu items added by plugin
  91. Issues separating my Plugin pages into different files
  92. SHARING TO FACEBOOK – FROM DYNAMICALLY GENERATED PAGE
  93. Custom field fetch error on woocommerce pdf invoice
  94. Import js variables loaded via wp_localize_script() into js module without global scope connection
  95. Custom taxonomy with page post type – WordPress
  96. Query posts by custom taxonomy slug in WP REST API?
  97. oneOf JSON Schema validation not properly working for custom post meta value?
  98. Too few arguments at registering new templates in my plugin
  99. I want to lists posts in wordpress to nearest location entered by the user
  100. how to check elementor is widget is active or loaded
deneme bonusu veren sitelerbahis casinomakrobetceltabetpinbahispolobetpolobet girişpinbahis girişmakrobet girişpulibet girişmobilbahis girişkolaybet giriş