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HomeBackend DevelopmentPHP TutorialForced download of QR code images

This time I will bring you forced downloading of QR code images, and what are the precautions to implement forced downloading of QR code images. The following is a practical case, let’s take a look.

/* 下载二维码 */
 public function 测试(){
  // 接收传递的参数
  $data['keys'] = [ 'b01id'=>trim(I('get.b01id')),
       'b02id'=>trim(I('get.b02id')),
       'b03id'=>trim(I('get.b03id')),
       'brid'=>trim(I('get.brid')),
       'unicon'=>trim(I('get.unicon'))];
  if(empty($data['keys']['b01id'])) $this->error('商户不存在',U('Seller/index'),3);
  $res = D('Sellerbrcode')->download($data); //方法在下面
  if(!is_array($res)) $this->error($res,U('Seller/index'),3);
  if(!empty($res['error'])) $this->error($res['error'],U('Seller/seebrcode?'.$res['url']),3);
  // 制作扫码牌
  $bgimg = imagecreatefromstring(file_get_contents($res['bgimg'])); // 拿到背景图做画布
  import('Component/phpqrcode',APP_PATH,'.php');  // 引入二维码生成类
  // 如果有扫码123二维码,则生成扫码123二维码
  if('' != $res['codea']){
   /* 参数说明:
    * 参数1:二维码需要保持的值
    * 参数2:false代表直接输出,其他则是生成的文件名
    * 参数3:纠错级别:L、M、Q、H
    * 参数4:点的大小,数值越大图片越大
    * */
   \QRcode::png($res['codea'], $res['codeimg'], 'H', 18);
   /* 使用图片缩放方法
   bool imagecopyresized($dst_im,$src_im,$dst_x,$dst_y,$src_x,$src_y,$dst_w,$dst_h,$src_w,$src_h)
     dst_im 目标图像链接的资源。
     src_im 源图像链接的资源。
     dst_x X坐标的目的地。
     dst_y y坐标目的地。
     src_x X坐标的源点。
     src_y y坐标源点。
     dst_w 目的地宽度。
     dst_h 目标高度。
     src_w 源宽度。
     src_h 源高度。
    * */
   $codeimg = imagecreatefromstring(file_get_contents($res['codeimg'])); // 拿到二维码图片
   $bg_info = getimagesize($res['codeimg']);        // 得到原二维码图片的大小
   imagecopyresized($bgimg,$codeimg,1520,550,0,70,700,666,$bg_info[0],$bg_info[1]-36);
  }
  // 如果存在银联云闪付二维码,则生成银联云闪付二维码图片
  if('' != $res['codeb']){
   \QRcode::png($res['codeb'], $res['paycodeimg'], 'H', 18);
   $codeimg = imagecreatefromstring(file_get_contents($res['paycodeimg']));// 拿到二维码图片
   $bg_info = getimagesize($res['paycodeimg']);       // 得到原二维码图片的大小
   imagecopyresized($bgimg,$codeimg,236,536,0,80,750,670,$bg_info[0],$bg_info[1]-80);
  }
  // 如果存在商户推广二维码,则生成商户推广二维码图片
  if('' != $res['codec']){
   \QRcode::png($res['codec'], $res['bridimg'], 'H', 18);
   $codeimg = imagecreatefromstring(file_get_contents($res['bridimg'])); // 拿到二维码图片
   $bg_info = getimagesize($res['bridimg']);        // 得到原二维码图片的大小
   imagecopyresized($bgimg,$codeimg,1375,1288,0,0,230,230,$bg_info[0],$bg_info[1]);
  }
  // 如果存在商户名称
  if('' != $res['bName']){
   // 为了让文字居中,需要计算左偏移量
   preg_match_all("/[0-9]{1}/",$res['bName'],$len1);     // 得到字符串中的字数量
   preg_match_all("/[a-zA-Z]{1}/",$res['bName'],$len2);    // 得到字符串中的字母数量
   preg_match_all("/([\x{4e00}-\x{9fa5}]){1}/u",$res['bName'],$len3); // 得到字符串中的中文数量
   $left = 610 - (count($len1[0]) * 16) - (count($len2[0]) * 15) - (count($len3[0]) * 28);
   $res['filename'] .= '_' . $res['bName'];       // 追加二维码名称
   $black = imagecolorallocate($bgimg, 0x20, 0x57, 0xa0);    // 字体颜色
   imagefttext($bgimg, 42, 0, $left, 480, $black,'./Public/font/msyh.ttf',$res['bName']);
  }
  // 如果存在二维码编号,则写入二维码编号
  if('' != $res['brid']){
   $black = imagecolorallocate($bgimg, 0x3e, 0x75, 0xc7);    //字体颜色
   imagefttext($bgimg, 30, 0, 1720,1190, $black,'./Public/font/msyh.ttf',$res['brid']);
  }
  // 添加银联云闪付logo
  $codeimg = imagecreatefromstring(file_get_contents($res['union']));  // 拿到二维码图片
  $bg_info = getimagesize($res['union']);         // 得到原logo图片的大小
  imagecopyresized($bgimg,$codeimg,550,760,0,0,120,120*$bg_info[1]/$bg_info[0],$bg_info[0],$bg_info[1]);
  // 添加添加扫码123logo
  $codeimg = imagecreatefromstring(file_get_contents($res['logo']));  // 拿到二维码图片
  $bg_info = getimagesize($res['logo']);         // 得到原logo图片的大小
  imagecopyresized($bgimg,$codeimg,1805,770,0,0,120,120*$bg_info[1]/$bg_info[0],$bg_info[0],$bg_info[1]);
  $res['filename'] .= '_' . date('Y-m-d',time()) . '.png';    // 追加二维码名称
  header('Pragma: public'); // required
  header('Expires: 0');  // no cache
  header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
  header('Cache-Control: private',false);
  header('Content-Type: application/force-download');
  header('Content-Disposition: attachment; filename="'.$res['filename'].'"');
  header('Content-Transfer-Encoding: binary');
  header('Connection: close');
  imagepng($bgimg);
 }
/* 生成图片前 拼接数据 */
public function download($data){
$tool = D('Tool');
// 得到公共类
$mysql = M();
$admin = I('session.admin');
/* 拼接url,方便以下错误时,跳转使用 */
$show['url'] = 'b01id='.$data['keys']['b01id'];
// 如果传递了用户id,那么判断该用户是否属于该商户
if($data['keys']['b03id'])
$show['url'].= '&b03id='.$data['keys']['b03id'];
// 如果传递了二维码id
if($data['keys']['b02id'])
$show['url'].= '&b02id='.$data['keys']['b02id'];
// 如果传递了银联云闪付
if($data['keys']['unicon']) $show['url'].= '&unicon='.$data['keys']['unicon'];
// 如果传递了推广二维码
if($data['keys']['brid'])
$show['url'].= '&brid='.$data['keys']['brid'];
// 调用上部方法得到数据
$data = $this->seebrcode($data,$tool,$mysql,$admin,false);
if(!is_array($data)){ return ['error'=>$data,'url'=>$show['url']]; }
/* 得到要展示的数据
*/
$show['bgimg']
= './Public/img/qrcode/qrcode.png';
// 背景图片地址
$show['logo']
= './Public/img/qrcode/logo.png';
// 扫码123的logo地址
$show['union'] 
= './Public/img/qrcode/unionPay.png';
// 银联logo地址
$show['codeimg']
= './Public/img/qrcode/code.png';
// 普通二维码生成的保存地址
$show['paycodeimg'] = './Public/img/qrcode/paycode.png';
// 银联二维码生成的保存地址
$show['bridimg']
= './Public/img/qrcode/brid.png';
// 商户推广二维码图片的保存地址
$show['filename']
= '扫码123收款二维码';
// 二维码名称
// 扫码123二维码内容
$show['codea']
= (!$data['keys']['b02id']) ? '' : isset($data['qrcode'][$data['keys']['b02id']]) ? $data['url1'].$data['qrcode'][$data['keys']['b02id']]['brCode'] : '';
// 扫码123二维码编号
$show['brid']
= (!$data['keys']['b02id']) ? '' : isset($data['qrcode'][$data['keys']['b02id']]) ? 'NO.'.$data['keys']['b02id'] : '';
// 银联二维码
$show['codeb']
= (!$data['keys']['unicon']) ? '' : isset($data['qrcode'][$data['keys']['unicon']]) ? $data['qrcode'][$data['keys']['unicon']]['brCode'] : '';
// 商户推广二维码
$show['codec']
= (!$data['keys']['brid'])
 ? '' : isset($data['download'][$data['keys']['brid']]) ? $data['url2'].$data['download'][$data['keys']['brid']]['brCode'] : '';
// 商户名称
$show['bName']
= empty($data['seller']['bShortName']) ? (empty($data['seller']['bName']) ? (empty($data['seller']['bCode']) ? $data['seller']['b01id'] : $data['seller']['bCode']) : $data['seller']['bName'] ) : $data['seller']['bShortName'];
/* 如果存在旧图片,则删除旧图片 */
if(is_file($res['codeimg']))
unlink($res['codeimg']);
// 删除旧的扫码123二维码图片
if(is_file($res['paycodeimg'])) unlink($res['paycodeimg']); // 删除旧的银联云闪付二维码图片
if(is_file($res['paycodeimg'])) unlink($res['paycodeimg']); // 删除旧的商户推广二维码图片
return $show;
}

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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