Generate PDF using tcpdf from WordPress admin side custom page [closed]

I would recommend doing this:

On the page where you are currently trying to output the PDF to the browser, save the PDF to a file on your server instead. Then, add a link to the file on your admin page.

This way the download of the PDF is a separate browser GET request and there will be no problem with headers.

If you are trying to output HTML and a PDF on the same admin page then it will never work, no matter how early in the page-render you put the PDF output.

Related Posts:

  1. Changing Admin Menu Labels
  2. Is there ANY way to remove comments function and section totally?
  3. How to display a static HTML page while setting up a WordPress site?
  4. How can I uninstall a language?
  5. Best way to present options for home page in admin?
  6. How to add a custom metabox to the Menu Management admin screen?
  7. How to change the wording in wp-admin back-end?
  8. How to make ajax call in wordpress in right way?
  9. Delete Post From front Page ( With Wp-admin restriction )
  10. Custom user role that can only edit specific (non-custom-type) page and all child pages [duplicate]
  11. Add mass action to wp-admin/users.php
  12. Bulk Delete Users Error uri too large
  13. Add button in TinyMCE editor to insert text
  14. Add column to pages table
  15. wp-admin – save options without refreshing?
  16. How to get the password and username of the add new user form (admin back end) in wordpress
  17. Change the Return URL from the Customizer
  18. Where can I edit Admin Panel Page file
  19. WordPress Error establishing a database connection For Admin login only
  20. How do you modify CSS files via admin panel?
  21. Image editing: “Edit Original” and “Replace” buttons missing on old posts
  22. WooCommerce – filter by featured products in admin
  23. How to prevent parent admin page from appearring as a child admin page
  24. Replace wordpress login logo with custom text
  25. How to clone wp-admin and make a new dashboard controlled by your code?
  26. Failed to load resource admin-ajax.php
  27. Custom WordPress Dashboard for Specific user role
  28. After login get “403 Forbidden”
  29. How to display a Ninja Form on the WordPress admin pages
  30. Why are my frontend theme styles bleeding into the backend?
  31. Show Welcome Panel on Dashboard for every user
  32. Is it possible to add an item the Post Publish panel?
  33. Execute script only on certain admin pages
  34. Uncheck the box “Send User Notification” by default on new-user.php
  35. WordPress Options Page not working
  36. Admin account locked out/redirect loop. Other accounts work?
  37. Add count for new registered user in Users tab
  38. How To Differentiate Drafted product and Publish Product through Color?
  39. Sortable columns and admin like interface for tables/report in custom plugin?
  40. Remove favorites action menu and screen options panel
  41. WP admin page gives 404
  42. No access local wordpress website after PC formating
  43. How to prevent the editor from redirecting to website within iframe?
  44. is_admin() not working when updating a post in the admin panel
  45. Why is server preventing admin styles? (Was: Where are WordPress sessions saved?)
  46. How can I replace dashboard.css and dashboard.min.css (not add new css)
  47. wp-admin throwing 500 errors after update to 4.2.1
  48. How to use underscore.js in WordPress Admin
  49. Detect Featured Image remove while editing post in wp-admin (client-side)
  50. Cannot log in to the admin, no error message [closed]
  51. Need help for WordPress User Session Management?
  52. meta box on new admin page
  53. Create reviews and star-rating for user accounts in wp-admin [closed]
  54. Disable Admin CP authentication (or auto login)
  55. Site Crashes When Updating to WordPress (Version 3.6)
  56. can’t access backend while frontend works perfect
  57. Admin top level menu, pointing to an external url
  58. Change of IP Address
  59. Developer/Designer asking for admin access
  60. How can I control which plugins run in the dashboard?
  61. How to change home page only in WordPress
  62. User Roles: How to hide a plugin from showing in WP-Admin?
  63. Too Many Redirects – WP-Admin Only
  64. WP Admin Login keeps redirecting to login
  65. WordPress admin section appears broken
  66. Is WordPress secure enough for a multi-user article directory?
  67. Pages section (only) not loading after publishing large number of pages
  68. Wp-admin widgets have no title texts
  69. How to create directory under my active theme directory
  70. CPU overload spam – redirect link to wp-admin and new post
  71. define two login page url
  72. wp-admin 503 error
  73. Admin Page access
  74. On Users (user.php) in wp-admin disable/hide “Bulk Actions” and “Change Role To”
  75. Add HTML to custom post type edit page
  76. WP site after login keeps redirecting to looped url [closed]
  77. Locked out of site admin after change of URL
  78. Login issue with subdomain installs
  79. Redirect from wp-admin back to page
  80. How can I can I make changes to a WP project I pulled from GItHub?
  81. WordPress critical error on wp-admin page with 100% permissions
  82. Edit “Not Available” Page
  83. admin-ajax and external service interaction
  84. Add admin page to the top of the admin panel
  85. Admin page changes the $_POST data
  86. Add item to admin panel – w/o plugin & theme
  87. Wp-admin Redirection loop after moving to subdirectory
  88. site identity will not update [closed]
  89. Show only childs and grandchilds of certain post in admin
  90. str_replace in wp-admin
  91. Admin area is not loading properly
  92. Using meta_query in add_query_arg
  93. Creating another wordpress site as sub-domain of a wordpress site
  94. Is it possible to change the images source that are shown in the admin side?
  95. Using query string on edit CPT page
  96. $current_screen if condition for a specific page in admin
  97. All of my WordPress sites have Bold Open Sans
  98. My website does not load since two days!
  99. After Upgrade: $user becomes unknown (id: 0) after successful login?
  100. how to Hide all products except the General Manager role in the WordPress admin panel?