PHP: mysql 5.7 and php 5.6 导入记事本编号查询不了和中文乱码问题

-- https://dev.mysql.com/doc/refman/8.0/en/charset-database.html
show variables like "character_set_%";

CREATE DATABASE `geovindu` CHARACTER SET utf8 COLLATE utf8_general_ci;
-- mysql官方说明文档才知道原来MySQL8.0已经已经把默认字符集升级成ut8mb4了,和5.0有区别

ALTER DATABASE geovindu
    DEFAULT CHARACTER SET utf8
    DEFAULT COLLATE utf8_general_ci
;


SELECT DEFAULT_CHARACTER_SET_NAME, DEFAULT_COLLATION_NAME
FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = 'geovindu';

USE geovindu;                                              
SELECT @@character_set_database, @@collation_database;

  //上传excel 记事文本 txt 文件编码utf-8 不用转码,但查询,从键盘输入查询不了,只能从数据库存储的编号复制查询可以,虽然看起来显示一样的编号,但就是查询不了   mb_detect_encoding
	// 记事本TXT 简体中文操作系统下,文件编码ANSI,需要转码,可以查询
    function doGeovinDuUptxt(){
        import('ORG.Net.UploadFile');
        $upload = new UploadFile();// 实例化上传类
        $upload->maxSize  = 3145728 ;// 设置附件上传大小
        $upload->allowExts  = array('txt');// 设置附件上传类型 txt 文本类型
        $upload->savePath =  './uploads/xls/';// 设置附件上传目录
        $upload->saveRule = time().'_'.mt_rand(100,999);//设置上传文件规则
        if(!$upload->upload()) {// 上传错误提示错误信息
            $this->error($upload->getErrorMsg());
            $resp=array("stats"=>"error","msg"=>'上传失败！');
            echo json_encode($resp);
            exit;
        }else{// 上传成功
            $uploadList = $upload->getUploadFileInfo();//获取上传成功信息
            require_once './data/PHPExcel2/Classes/PHPExcel.php';
            define('WWW_PATH',str_replace('\\','/',realpath(dirname(__FILE__).'/../'.'/../'.'/../'.'/../')));
            $filePath =WWW_PATH.'/uploads/xls/'.$uploadList[0]['savename'];
            //快递类型 9f_scanorder
            $db_scan=M('duscanorder');

            $fp_in = fopen($filePath, "r");
            while (!feof($fp_in)) {
                $line = fgets($fp_in);
                $geovindu=explode('#', $line);//如果有分割
                //$data['code']=trim($line); //iconv('utf-8','gb2312', $val)
				$data['code']= iconv('GB2312', 'UTF-8', trim($geovindu[0]));//trim($geovindu[0]);//TXT文件编码是UTF-8 直接用这个,数据库存储编号是一样,就是查询不了
				$data['cnname']=iconv('GB2312', 'UTF-8',trim($geovindu[1])); //trim($geovindu[1]);//                iconv('utf-8','gb2312',trim($geovindu[1])); //中文
				$data['enname']=iconv('GB2312', 'UTF-8',trim($geovindu[2]));//trim($geovindu[2]);//
                $db_scan->add($data); //添加至数据库 iconv('GB2312', 'UTF-8', $str); 
            }

            }

            $this->msg('导入成功！',U('index'));
            // showMsg('上传成功！');

    }