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   1 # string http\Cookie::getCookie(string $cookie_name)
   2
   3 Retrieve a specific cookie value.
   4 See http\Cookie::setCookie().
   5
   6 ## Params:
   7
   8 * string $cookie_name
   9   The key of the cookie to look up.
  10
  11 ## Returns:
  12
  13 * string, the cookie value.
  14 * NULL, if $cookie_name could not be found.