setcookies and header send

Question

I put simple php condition in the header.php of template as this :

setcookie("test_time_".$cookie_id."", $cookies_times, time()+3600);

The result always as this headers already sent, I use this inside plugin and also I try outside the plugin and the result always the same.

It´s possible use cookies in header or what can i do for fix this problem , I need use cookies for works little function.

Answer 1

The issue you have appears because you set your cookies too late. You have to set it before anything will be rendered. Set your cookies in the your-plugin-file.php file.

Also you can check if headers were sent or not by calling headers_sent() function:

add_action( 'init', 'wpse8170_init' );
function wpse8170_init() {
    if ( !headers_sent() ) {
        setcookie("test_time_".$cookie_id."", $cookies_times, time()+3600);
    }
}