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Note that you must cast the result of http_parse_cookie to an array before passing it to http_build_cookie (see http://bugs.php.net/bug.php?id=47740 ).
Example:
<?php
$cookie = http_parse_cookie('RMID=2dab5fc9296749c2f28ec0b7; expires=Saturday, 20-Mar-2010 01:34:06 GMT; path=/; domain=.example.com');
var_dump(http_build_cookie((array)$cookie));
?>
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