Codeigniter isset（）with或condition不在多个参数中工作

Question

$viewdata['branch']= $this->input->post('branch'); 
if (isset($viewdata['branch']) || isset($viewdata['address']) || isset($viewdata['timings']) || isset($viewdata['clinic']) || isset($viewdata['latitude']) || isset($viewdata['longitude']) || isset($viewdata['image'])) {
    //print_r($viewdata);exit;
    $logid = $this->Adminmodel->Insertdata("table", $viewdata);
}

为什么isset()条件不适用于Or。它直接插入表中。我该怎么办？