Hook for validating and rejecting frontend image upload

I found it after trying with several hooks.

Use ‘init’ and check if $_FILES is empty, if not, do what you want to do.

init hook

Related Posts:

  1. Hook to get image filename when it is uploaded
  2. How can I add an image upload field directly to a custom write panel?
  3. Hook event for upload image in the menu
  4. Is there a better way to implement responsive images than what WordPress uses by default?
  5. What filter should I use to insert a button inside on Media>Add New
  6. Upload multiple images and insert them into custom html code
  7. Cleaning a filename after image sideloading a url that contains `%20`
  8. How to move an image in a plugin to the upload directory and make it as a media of wordpress?
  9. WordPress discards PNG file when uploading plugin file
  10. Is it possible to convert various image types from remote URLs to WebP and then serve them immediately?
  11. Using “add_image_size” to register custom image sizes inside plugins not working
  12. Leveraging Core Functionality in Icon Upload Plugin [closed]
  13. Upload to a specific media folder created by FileBird Lite
  14. Standard location for plugin to save/cache files?
  15. Add a new tab to WordPress Plugin install Listing
  16. Changing Plugin Load Order
  17. Admin settings update updating every time home page is hit?
  18. Global Objects and Public Methods
  19. How should you hook a session_start() when authoring a plugin?
  20. Init action hook running late after PayPal’s return url?
  21. How Do I Load My Action Earlier Enough?
  22. Does WP fire delete_post when trashed posts are automatically deleted?
  23. How to catch images with blank dimensions?
  24. How to add a link to WordPress Plugin install Listing
  25. I can’t find where a hook is being defined in a plugin – Easy Digital Downloads
  26. Why are two functions over-riding each other?
  27. Set first image (external) as featured image / thumbnail
  28. Hook for post permalink update
  29. Get returned variable from a function to add_shortcode function
  30. How can I add a custom meta value on file upload?
  31. How to get an image transferred via FTP or script to appear in Media Manager?
  32. Create a plugin to change the action to which a function is hooked
  33. Can I differentiate between “Delete Post Permanently” and “Empty Trash” and do something for each accordingly?
  34. Using the component outside the editor. select(‘core’) is null
  35. comment_email hook doesn’t seem to work for comment editor field
  36. unable to stop loop when using wp_insert_post with publish_post hook
  37. How to rename image at uploading on specific plugin or post-type in WordPress
  38. WordPress Ajax callback function from plugin – OOP
  39. How to show large image in checkout page using WP Ecommerce plugin [closed]
  40. Adding Attachment Display Settings in custom media frame
  41. Where and how does WordPress store and use its plugin and hook information?
  42. edit_{$taxonomy} | Hook
  43. Using the default wordpress uploader inside plugin
  44. WordPress after content Hook & external template part
  45. Changing upload dir in a plugin regardless of post type
  46. best practice for query string values – get_query_var always empty for my value supplied in query string
  47. Modifying meta tags after doing ajax call in plugin
  48. Where to add hooks in a class
  49. How to use output buffering in WordPress hooked functions?
  50. Adding option to Gallery shortcode
  51. Can’t upload image using media_sideload_image
  52. Get attachments from a post
  53. I have 2 plugins using the same wp_login action hook and one is not working
  54. use of do_action() without any functions attached
  55. How to get all queries’s results after they have executed?
  56. Odd map_meta_cap $args on post edit — sometimes integer, sometimes string
  57. How can I create a custom plugin that allows anonymous users to signup without registering?
  58. Bind a function with its own argument to show something dynamically after every content
  59. Uploaded attachment not set as featured image
  60. What’s the hook for filtering every texts of site?
  61. Hook add_attachment error
  62. Associate multiple email addresses with the same user account, so they can log in with either
  63. Update variable value via add_filter
  64. Custom filter not working
  65. hook update_option/updated_option empty $old_value and $value
  66. Configure WordPress to Generate Scheme-less Relative URLs
  67. How to find list of all functions bind to a particular hook from my plugin?
  68. How to list all images used on a specific page?
  69. Screenshots on plugin page taken old [closed]
  70. apply_filters() and call_user_func() to define and call a function outside a class
  71. Insert and read media from the WordPress library and call in the plugin
  72. WordPress5.2.3: Better File Download Plugin validation issue
  73. Problem in plugin debuging in wordpress
  74. Uploading images to custom table
  75. OOP development and hooks
  76. Plugin Development – Call to undefined function comment_exists()
  77. Add_action not calling callback function
  78. How to destroy or dispose wordpress uploder/manager?
  79. Function not working on any file other than the main plugin file
  80. Caption Shortcode: what filter to change the image size?
  81. Does WordPress have something like timer hook?
  82. Multi hook deploiement
  83. Can I use a hook other than ‘init’ to handle form submissions?
  84. Template file structure , wordpress hook for altering the template
  85. woocommerce single product page hook not working
  86. How can I set a dynamic value for post_updated_messages based on return value of post_updated?
  87. Issue on Getting WP Gallery Items In cpt-single.php As Attachments
  88. What is the use of wp_schedule_event hook?
  89. Displaying $_FILES data (simlar to $_POST)
  90. How do I replace title with my plugin?
  91. Looking for Hook that is fired after a plugin or wp upgrade is installed/updated
  92. Woocommerce: block user removing cart item
  93. How to automatically convert images to WebP on WordPress?
  94. Load images from CDN and custom features to “Add Media” dialogue
  95. Execute callback after REST API request completes + Response is sent
  96. Set srcset on a block image
  97. How to customize password reset message page on success if no error in password reset
  98. Do uploaded files to /tmp/ get deleted in WordPress automatically?
  99. How to modify the uploads directory for wp.media.frame assigning an subfolder name
  100. how to execute a function only when i send an order to trash [closed]