$upload_name = implode('_', array('qq')); dpm($upload_name);
如果array() 则$upload_name是空白
如果array('qq')则$upload_name是qq
如果array('q','b')则$upload_name是q-b
$upload_name = implode('_', array('qq')); dpm($upload_name);
如果array() 则$upload_name是空白
如果array('qq')则$upload_name是qq
如果array('q','b')则$upload_name是q-b