上传文件定位到指定的根目录！

$speaker_photo    = $_FILES['speaker_photo'];
...
//[1]添加一个讲演嘉宾
            $speakerBaseInfo = array(
                'speakername'        => $speaker_name,
                'speaker_photo'        => "speaker_".time().".jpg",
                'office_position'    => $speaker_office_position,
                'speakerintro'        => $speaker_intro
            );
            $uploaddir     = $_SERVER['DOCUMENT_ROOT'].$this->_request->getbaseUrl().'/images/eesmart/speakerimg/';    
            $uploadfile = $uploaddir.$speakerBaseInfo['speaker_photo'];
            move_uploaded_file($speaker_photo['tmp_name'],$uploadfile);

用 $_SERVER['DOCUMENT_ROOT']准确的定位到网站根目录，准确方便也快捷！