Delete cookies from .domain.com in PHP -


I have cookies which I want to use PHP. I can read cookies from .domain.tld to the $ _ cookie variable, but I can not remove them. I tried to remove them from domain.tld and subdomain.domain.tld , but did not work. How do I delete cookies from .domain.tld

Here's the code I am using: 

  setcookie ( $ K, '', time () - 60 * 60 * 24, '/');    
 
 
 Try it out.  
  $ past = Time () - 86400; Setkey ($ k, '', $ past, "/", ".domain.tld");

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