setcookie, Cannot modify header information – headers already sent [duplicate]

by

The warning is clear.

Warning: Cannot modify header information – headers already sent by (output started at C:\xampp\htdocs\test\index.php:9) in C:\xampp\htdocs\test\index.php on line 12

Cookies are sent in the HTTP response header. Since the HTML content already started, you cannot go back to the header and add the cookie.

From http://php.net/setcookie:

setcookie() defines a cookie to be sent along with the rest of the HTTP headers. Like other headers, cookies must be sent before any output from your script (this is a protocol restriction). This requires that you place calls to this function prior to any output, including <html> and <head> tags as well as any whitespace.

Move that setcookie statement before any HTML appears:

<?php
 $value="something from somewhere";

 setcookie("TestCookie", $value);
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
....

More Related Contents:

  1. How to post data in PHP using file_get_contents?
  2. Allow php sessions to carry over to subdomains
  3. How to make asynchronous HTTP requests in PHP
  4. Forcing to download a file using PHP
  5. Detecting request type in PHP (GET, POST, PUT or DELETE)
  6. how to get the cookies from a php curl into a variable
  7. How to send a GET request from PHP?
  8. Easy way to test a URL for 404 in PHP?
  9. How can I select and upload multiple files with HTML and PHP, using HTTP POST?
  10. PHP session without cookies
  11. PHP login system: Remember Me (persistent cookie) [duplicate]
  12. Set a cookie to never expire
  13. Persistent/keepalive HTTP with the PHP Curl library?
  14. ByetHost server passing html values “Checking your browser” with JSON String
  15. how to delete all cookies of my website in php
  16. Send post request using Volley and receive in PHP
  17. PHP Curl – Cookies problem
  18. Setup HTTP expires headers using PHP and Apache
  19. What is the difference between Sessions and Cookies in PHP?
  20. Request headers bag is missing Authorization header in Symfony 2?
  21. Add http:// prefix to URL when missing
  22. How can I set a cookie and then redirect in PHP?
  23. Authorization header missing in PHP POST request
  24. Cookies vs. sessions in PHP
  25. How to get cookie’s expire time
  26. NginX issues HTTP 499 error after 60 seconds despite config. (PHP and AWS)
  27. Setting a cookie in an AJAX request?
  28. Parsing HTTP_RANGE header in PHP
  29. Allowing users to Refresh browser without the “Confirm Form Resubmission” pop-up
  30. How to send cookies with file_get_contents

Leave a Comment