Includes an instance of the CommentInfo class; for holding inforecords about the comment
If the Comment object describes an existing user; use the internal info object to get, set, unset and test for existence (isset) of
info records
$this->info = new CommentInfo ( 1 ); // Info records of comment with id = 1
$this->info->browser_ua= "Netscape 2.0"; // set info record with name "browser_ua" to value "Netscape 2.0"
$info_value= $this->info->browser_ua; // get value of info record with name "browser_ua" into variable $info_value
if ( isset ($this->info->browser_ua) ) // test for existence of "browser_ua"
unset ( $this->info->browser_ua ); // delete "browser_ua" info record