Description:
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According to the documentation the setcookie() implements RFC 6265.According to this RFC the cookie name is a 'token'. The 'token' is defined in RFC 2616. According to RFC 2616 a token is:

token          = 1*<any CHAR except CTLs or separators>
separators     = "(" | ")" | "<" | ">" | "@"
                  | "," | ";" | ":" | "\" | <">
                  | "/" | "[" | "]" | "?" | "="
                  | "{" | "}" | SP | HT 

As a consequence statements like "setcookie("cookie[three]", "cookiethree");"
are not compliant with RFC 2616.
Above statement is from the setcookie() documentation: Example #3 setcookie() and arrays

Expected result:
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Easy way out would be to add a note to the documentation that the use of '[' and ']' is not compliant with RFC 6265.