thinkphp实现单图片上传

            $config=array(
                \'maxSize\'   => 3145728,
                \'savePath\'  => \'./Public/Uploads/\',
                \'rootPath\'  => \'./\',          //这样写上传到网站根目录下的public下
                \'exts\'      => array(\'jpg\',\'gif\',\'png\',\'jpeg\'),
                \'autoSub\'   => true,
                \'subName\'   => array(\'data\',\'Ymd\')
            );    //定义配置数组
            $upload = new \Think\Upload($config);   //实例化上传对象
            $info = $upload -> uploadOne($_FILES[\'peitu\']);    // 执行单个图片上传，并获取上传结果
            if(!$info){
                $this->error($upload->getError());
            }else{
                $data[\'img_src\'] = $info[\'savepath\'].$info[\'savename\'];        //将上传文件的保存路径存到数据库以便前台调用
            }