how to sanitize checkbox input?

Be sure to set the value in your markup. You should have.

<input type="checkbox" name="changeposition" value="yes" />

Then, I’d suggest using sanitize_key() to sanitize.

Keys are used as internal identifiers. Lowercase alphanumeric
characters, dashes and underscores are allowed.

Think of the word yes, as a key. That’s what you’re expecting is a lowercase alphanumeric value.

See also: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/checkbox

If the value attribute was omitted, the submitted data would be given a default value of on, so the submitted data in that case would be subscribe=on.

Related Posts:

  1. I’m confused about URL sanitization in meta boxes
  2. Custom-Metaboxes-and-Fields text_url field prepending http://
  3. Add a Meta Box for uploading a SECOND Featured Image?
  4. Remove the Featured Image Meta Box
  5. Remove the Yoast SEO Post Metabox [closed]
  6. Sample code for validating custom metabox?
  7. How to add a class to meta box
  8. Use meta box drag and drop to order items independently
  9. inside a metabox
  10. Add Meta box Befoure Post Title
  11. Tinymce/WordPress is removing all line-breaks?
  12. Editing the Default Links like “Site Admin” in the Sidebar Meta Section?
  13. Editing Screen: Make Update or Publish Button Follow The Page
  14. Custom “Publish” / “Update” button &
  15. Why can’t I hook into save_posts after admin_init?
  16. Meta Boxes in Front End Post Submission Form
  17. Remove a plugin meta box from the dashboard
  18. How to make multicheck for post/page meta box
  19. Replace the Post Excerpt Meta Box with a Field in My Custom Meta Box
  20. How to show post format gallery metabox image caption in the post front end
  21. Get image captions for images on gallery post format metabox
  22. Metabox of one post influence setting on other
  23. Display Single Attachment Image file size, uploaded date, resolution, file-name etc in Sidebar
  24. Remove a metabox registered by another plugin – Woocommerce [closed]
  25. Possible to limit custom meta boxes depending on what page template is used?
  26. Adding Metaboxes – so much code is there a shorter DRY way?
  27. Show or hide custom meta box not work with Gutenberg
  28. unable to save post meta on single field with multiple selects
  29. Add Slug Metabox to posts for contributors
  30. Hide meta box based on post format
  31. TinyMCE with custom buttons on a meta box
  32. How do i hide the auto-generated custom field that’s created when update_post_meta() is called?
  33. WPAlchemy: How to output values?
  34. save_post not working with attachments
  35. get $post (object,parts/values) in meta-box
  36. How to get meta box values – WP tuts tutorial
  37. How to add categories to page editor?
  38. Change Metabox Title
  39. Having trouble getting my meta data to save
  40. add wp_editor to custom_meta_box
  41. Show how many images are attached to a post/page on compose page
  42. Metabox context for page post type
  43. Show Meta Box On Specific Page Template
  44. How to use MarkDown in a custom textarea field?
  45. On click hide group of metabox, similar to screen options checkbox?
  46. Adding meta box without add_meta_box – is this bad?
  47. How to make a stand-alone button to the post edit view
  48. saving data entered into a Metabox into an array? for use with for/each output.
  49. Cusotm MetaBox content not getting saved
  50. How to get the meta box name and value
  51. wp_editor loses data, perhaps an html_entity_decode problem?
  52. My custom write panels won’t save data. What am I missing?
  53. How to position user meta data field
  54. How to create a button click counter meta box?
  55. Display Content if Meta Checkbox is checked?
  56. meta box & callback function
  57. $_GET & $post_ID
  58. get_post_meta as a list for drop down search filter
  59. add_post_meta | update_post_meta | Via the frontend
  60. MetaBox with Editor instead of textarea – html not saved [closed]
  61. Use meta boxes inside an archive page template for Woocommerce
  62. Why do Metabox use Nonces?
  63. multi custom fields and taxonomy search
  64. Migrating from metaboxes to wp_editor()
  65. conditionally echo in meta box data loop
  66. Front end post and upload file, image for users without plugin
  67. Meta Box multi checkbox in template
  68. remove a single post_meta
  69. Dynamic number of fields in a meta box
  70. How to make a metabox that contains link categories?
  71. how to log in to WP if the “Log in” link under Meta is missing
  72. Echo 2 values from one key in Array with get_post_custom
  73. meta box pop up upload button wont work
  74. Add metabox to pages that use custom template in WordPress
  75. Meta Box – Javascript Datatable
  76. Metabox on a custom page – How to include the appropriate default scripts and styles?
  77. custom metabox nonce verification fails
  78. Extensible add_meta_box with apply filters
  79. use post meta in add_meta_boxes action
  80. Generating image sizes when uploading through wp.media
  81. Why is the text displaying, but not the textarea field itself?
  82. Meta box checkbox won’t save
  83. add_post_meta not saved
  84. Set post title to same value as a tow meta box
  85. add_post_meta Adds post meta but the value is blank
  86. Best practices for meta box placement?
  87. Echo order box (in pages)
  88. WP Alchemy – stripping my paragraph tags from textarea metaboxes
  89. Meta boxes not showing on custom post type. Blank page?
  90. Tags meta box don’t show when creating a new post type
  91. dynamically get post attachment while editing
  92. Remove duplicated values from meta box values
  93. Setting Event to Expire Using Custom Metabox
  94. Drop down menu’s not saving using Custom Meta Boxs in WordPress
  95. Remove Title, Editor and Meta Box Support Based on Post Formats
  96. Custom select box meta field
  97. Metadata in loops
  98. Saving an upload media meta box field
  99. Conditonally check if Custom Meta Box has input
  100. Metaboxes – why they don’t render php in expected manner?

Leave a Comment

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)