My code is like below.

$result = $wpdb->query($sql);
if ( $result ) {
  wp_redirect( "http://www.example.com/contact-us");

I am getting below error

Warning: Cannot modify header information - headers already sent by (output started at /var/www/html/wordpressplugin/wp-admin/includes/misc.php:1281) in /var/www/html/wordpressplugin/wp-includes/pluggable.php on line 1296

I tried with below code but I didn't get any solution

$result = $wpdb->query($sql);
if ( $result ) {
  wp_redirect( "http://www.example.com/contact-us");
  • 3
    Where are you putting this code? In a hook? In a file? "Headers already sent" means you're trying to redirect too late in the page load process.
    – Howdy_McGee
    Commented Aug 24, 2020 at 16:38

1 Answer 1


Add ob_start(); at the top of functions.php file and remove from your code. As WP is a combination of plugin and core files and we don't know which code sends the throws the header sent warning. And we know that functions.php is called every time we made a request to server, so this is the ideal place to add the ob_start() code to overcome the problem.

  • 2
    Please edit your answer, and add an explanation: why could that solve the problem?
    – fuxia
    Commented Aug 24, 2020 at 22:04
  • Thanks @Pradipta Sarkar. I am developing a plugin. Where should I place ob_start(); ? Thanks
    – abu abu
    Commented Aug 25, 2020 at 11:26
  • Can you add to your main plugin file and do a test? Commented Aug 25, 2020 at 15:25

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