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Detailed explanation of the steps to generate images with QR codes in PHP and force downloading

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Release： 2023-03-26 15:50:01
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This time I will bring you a detailed explanation of the steps to generate images with QR codes and force downloads in PHP. What are the precautions for PHP to generate images with QR codes and force downloads? 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;
}
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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!

Recommended reading:

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Detailed explanation of the method of php recording search engine crawling process

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