PHPOffice/PHPExcel — pull request #285 by Jazzo (2013-12-11 09:56:51+00:00)
Title: BugFix Issue #248 - Excel2007 does not correctly mark rows as hidden

In the main loop of load method in Excel 2007
if you print a var_dump($col["hidden"])
you'll get this:

object(SimpleXMLElement)#13032 (1) {
[0]=>
string(1) "1"
}

So, the "self::boolean" method, does not work properly.
I fixed that method including the "is_object" check.