wp_redirect problem using code snippets

You can’t use wp_redirect or make HTTP redirects from inside a shortcode, redirects must happen before HTTP headers are sent out, before any HTML is sent to the browser, so shortcodes will always be too late.

So I looked around and I believe the problem is that some content is sent to the browser before the redirection happens, but I can’t find what it is.

The site header, the opening HTML tag, it’s not specifically post content, but any output of any kind. It doesn’t matter if your call to add_shortcode happens before that, because it’s when the shortcode appears that matters, aka when the content is rendered.

Fundamentally, there is no way to fix this shortcode, and a shortcode can never be used to do this via PHP.

The closest you could reach while keeping a shortcode is a client side redirect in Javascript.

Instead, you should be performing this check on an action that happens before any HTML/output is made. Shortcodes are far too late.

Related Posts:

  1. Getting redirect to happen before header output
  2. wp_redirect() is not working
  3. Why won’t wp_mail() let me set the From: header when plain old PHP mail() will?
  4. wp_redirect() – headers already sent
  5. Admin bar and fixed header issue?
  6. How to remove rest api link: in http headers?
  7. disable wordpress canonical tag meta
  8. Why is wp_redirect() preferable to a standard PHP header redirect?
  9. Disable h1 and h2 from rich text editor combobox
  10. Recommended location to set response headers?
  11. Custom endpoint and X-WP-TotalPages (headers)
  12. Getting “Cannot modify header information – headers already sent” error on wp-admin only whenever any plugin is activated
  13. Additional Option on Custom Header admin
  14. Putting content into header.php without using wp_head
  15. Setting Last Modified HTTP Header on static Home Page
  16. If Modified Since HTTP Header
  17. Error messages when adding code to function.php or trying to delete inactive plugin files
  18. Image slider to display at the very top of home page
  19. URL Redirect and Bulk Actions in wp_list_table
  20. Indenting (tabbing) WP_head
  21. Why I can’t add a script-code into theme-settings without 403-forbidden?
  22. Is it wrong to put header tags inside WordPress help tabs? [closed]
  23. Authenticate a user for current request
  24. WordPress Redirect Not Working – AJAX Callback Response Not Picked Up
  25. Want to make header and footer CMS driven sothat Editors can modify its content from wordpress admin section
  26. Header: Include Date Published and Date Modified
  27. Page source contains an http item that makes page insecure; but in php files it’s written as https!
  28. Cleanup Body_Class
  29. Google Tag Manger – no-script Code Not Found
  30. How to remove main domain header title from after sub domain header title
  31. Remove all WordPress HTTP headers (not in-source embeds)
  32. WordPress 502 | Header Upstream send too big
  33. Creating dynamic header and footer files
  34. Strange 403 header response
  35. 404 or ugly page on IE, but Firefox, Chrome looks perfect
  36. Changing header text from uppercase to normal [closed]
  37. My header not showing up [closed]
  38. How to Access Script Tags in Header
  39. Where are my js and css links in header?
  40. Why does WordPress allow inserting tags into posts?
  41. Problems accessing stylesheets/scripts loaded in WP header
  42. Rotate images in header based on date
  43. Why does WP load so many files in the head of source code? How do I optimize it?
  44. How to add some lines to the wp-login.php header via functions.php?
  45. allowed_http_origins() only works in theme functions.php
  46. Is this a correct usage of ob_start() in my WordPress project?
  47. Why are tags from the header showing up on my WordPress site? [closed]
  48. How to register and set http/2 server prefetch for a specific asset?
  49. Header with content
  50. WordPress Template not getting my Sub-Header File
  51. How to add social follow button to header? [closed]
  52. Include two headers
  53. Custom headers in WordPress, are there also custom footers?
  54. Point get_header() to different plugin
  55. Front end posting, not working wp_redirect with ‘cannot modify header information’ error
  56. Headers already sent on a frontend post form using wp_redirect before get_header
  57. How do I get the Social Media Plugin to show up in my Twenty Eleven child theme’s header?
  58. Adding more tabs to horizontal navigation bar
  59. Code needs wrapper/container to put footer back in, but where?
  60. Dynamic height in custom header image panel
  61. How can I remove or change the tooltip of an icon
  62. Design Header meta on single posts wordpress
  63. Including PHP files in header.php
  64. Remove server response header
  65. Using a nonce Content Security Policy header for style-src for inline style elements returns errors
  66. How can I use an iframe element as my header media?
  67. Easiest way to use relative URLs in my WordPress header
  68. Should I use do_action in the header file?
  69. Video Header in 2016 theme
  70. Enable CORS for getting an inline SVG by URL
  71. Warning: Cannot modify header information – headers already sent by
  72. Stop plugin from adding cache headers
  73. my dashboard does not have the option to fix the header or change the theme. how can i get that to show?
  74. How to prevent a style sheet to affect a header.php or footer.php?
  75. How do I change top header background color
  76. Why is http header providing 404 while site is online?
  77. only header is showing up in posts
  78. How do I apply different headers to different pages using this template?
  79. force download a file in template_redirect hook
  80. video header in desktop view, image header in mobile view
  81. Force download of MP3 file in Safari
  82. How do you find the logo code on theme file or where can I find the header theme file?
  83. If is single in header.php [duplicate]
  84. Social icons on my index page don’t take visitor to specific site(s) [closed]
  85. show wordpress data without headers
  86. Override theme metadata in header
  87. Header Image instead of dynamic text
  88. Code to Show for One post only in head
  89. Checking if certain header meta data is set
  90. setCookie before headers are sent?
  91. Download custom file in wordpress backend [duplicate]
  92. Inject code in the header of my template
  93. Random header image but also specific header for certain pages
  94. Dynamically changing header text depending on URL in WordPress html page
  95. After being hacked Fatal error: Call to undefined function get_header() in 404.php on line 1
  96. change headline of page
  97. How change the header color?
  98. How to remove lines over text using Phlox theme with Elementor Pro?
  99. My CSS, footer and header don’t show up!
  100. End of script output before headers – multiple apache error_log errors
tech