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Gets the name (or names) of the primary key field(s) for the object.
API Docs: http://api.modxcms.com/xpdo/om/xPDOObject.html#getPK
mixed getPK ()
Get the PK of a Person object, who's PK field is 'id'.
$person = $xpdo->getObject('Person',1); $pk = $person->getPK(); echo $pk; // prints "id"