What am i doing wrong?

gistfile1.php

  	if(!empty($_POST)) {
			$datenow = new CDbExpression('NOW()');

			$systemaccountmodel->attributes=array('datecreated'=>$datenow,'createdbyuserid'=>0);
			$systemaccountmodel->save();
			$systemaccountid = Yii::app()->db->getLastInsertId();

			$_POST["Person"][1]['systemaccountid'] = $systemaccountid;
			$_POST["Person"][1]['datecreated'] = $datenow;
			$_POST["Person"][1]['createdbyuserid'] = 0;
			$personaldetailsmodel->attributes=$_POST["Person"][1];
			$personaldetailsmodel->save();
			
			var_dump($_POST);
		}

              if(!empty($_POST)) {
        $datenow = new CDbExpression('NOW()');

        $systemaccountmodel->attributes=array('datecreated'=>$datenow,'createdbyuserid'=>0);
        $systemaccountmodel->save();
        $systemaccountid = Yii::app()->db->getLastInsertId();

                    $personaldetailsmodel->attributes=$_POST["Person"][1];
        $personaldetailsmodel->systemaccountid = $systemaccountid;
        $personaldetailsmodel->datecreated = $datenow;
        $personaldetailsmodel->createdbyuserid = 0;

        $personaldetailsmodel->save();

        var_dump($_POST);
    }