How to set a cookie based on a page Get variable?

Question

I am trying to set a cookie, based on a GET variable from a page.

The page URL looks like: mysite.com/?my_var=somevalue

I'm trying this, but can't see what I'm doing wrong..

// make 'my_var' available as get_query_var('my_var')..
function add_query_vars_filter($vars){
    $vars[] = "my_var";
    return $vars;
}
add_filter('query_vars', 'add_query_vars_filter');

add_action('init', 'my_setcookie');

// take the query_var 'my_var' and set it as cookie 'my_cookie'
function my_setcookie() {
    setcookie('my_cookie', get_query_var('my_var'), strtotime('+1 day'));
}

Would love a little help with this!

Thanks in advance.

Answer 1

On the page where you want to set the cookie write this code and check

if(get_query_var('my_var') == 'somevalue'){
    setcookie('my_cookie', get_query_var('my_var'), strtotime('+1 day'));
}

If we go with your code then it will set coookie on every page who having query variable

?my_var=somevalue