How does PHP implement the image click Download and save locally? -----This example is a two-dimensional code generation image, and support click to download

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Today because of work needs, completed a two-dimensional code generation image, and support click to download the

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Controller files, related codes

1  //generate two-dimensional code2         $url= Action (' Apih5\\[email protected] ', [' provider ' = =$request-Channel]);3 //save QR Code to local and return QR code4         $qrcode=$this->app[' version ']->qrcode ($url);
5         $dir _path= '.. /public/static/versionchannel/';6         $fileName=$request->channel. '. png;7         $qrcode = Base64_decode ($qrcode);8 //Save to local, if the file does not exist, create a new9         $this->app[' Version ']->Saveversionqrcode ($qrcode, $dir _path, $fileName);Ten  One  //save QR Code to local and return QR code A         $qrcode=$this->app[' Version ']->qrcode ($request->channel,$url);

Background implementation of the downloaded controller

1<?PHP2 3 namespace App\http\controllers\apih5;4 5  Useilluminate\http\request;6 7  Useapp\http\requests;8  UseApp\http\controllers\controller;9 Ten classVersioncontrollerextendsController One { A     //version Two-dimensional code download -      Public functionDownload$provider, Request$request) -     { the         //download QR code -         $contenttype= ' Image/jpeg '; -         $dir _path= '.. /public/static/versionchannel/'; -         $fileName=$provider.‘. png; +         $fileurl=$dir _path.$fileName; -  +        Header("Cache-control:private");  A Header ("Content-type: $contenttype"); // set the file types to download  at Header ("Content-length:".) filesize ($fileurl)); // set the file size to download files                      -        Header("Content-disposition:attachment; Filename= ". UrlDecode ($fileName)); // set the file name to download  readfile($fileurl);             -  -     } in}

File where method is located

1  /**2 * Generate two-dimensional code for Apih5/versioncontroller3 * @param [Type] $id [description]4 * @return [Type] [description]5      */6      Public functionQRCode ($url)7     {8         $qrcode=NewQrcodehelper;9         $qrcode=$qrcode->GETVERSIONCHANNELQR ($url);Ten  One         return  $qrcode; A     } -  -     /** the * Save QR Code to local folder -     */ -      Public functionSaveversionqrcode ($qrcodeData,$dir _path,$fileName) -     { +         //determines whether the directory exists, does not exist, and generates -         if(!file_exists($dir _path) ) { +             mkdir("$dir _path", 0777,true); A         } at         $fileurl=$dir _path.$fileName; -         //Save to local, if the file does not exist, create a new -         file_put_contents($fileurl,$qrcodeData,File_use_include_path); -}

Front desk trying to

Displays the location of the QR code picture

1  <td>23       $version->channel])}} ">4            $version->channel. " PNG ')}} "/>5       </a>6 </td>

How does PHP implement the image click Download and save locally? -----This example is a two-dimensional code generation image, and support click to download