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<? // index.phprequire_once "class.main.php";$obj = new MAIN();$obj->Sub1->SubFunction("1");?><? // class.main.phpclass MAIN {  function Sub1($id) {    require_once "class.sub.php";    $obj->Sub1 = new SUB();  }}?><? // class.sub.phpclass SUB {  function SubFunction($id) {    print "ID: ".$id."";  }}?>