本文实例讲述了PHP使用 Imagick 扩展实现图片合成，圆角处理功能。分享给大家供大家参考，具体如下：

需求：为用户生成特定的二维码 ，拉取用户的微信头像 和特定的背景图合成一张用户专属海报

方法：采用PHP的Imagick扩展功能对图片进行合成处理。对微信头像进行圆角处理，然后压缩图片的质量

1. 根据微信用户特定id生成专属二维码

public static function getTicket($scene_id)
{
  $qrcode = '{"expire_seconds": 2592000,"action_name": "QR_SCENE","action_info": {"scene": {"scene_id": $scene_id }}}'; //二维码信息
  $access_token = self::getToken();  //公众号token，这个要获取自己公众号的
  $getticket_url = "https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=$access_token";
  $ticketinfo = self::request_by_curl($getticket_url,$qrcode);
  return $ticketinfo['ticket']; //专属二维码的ticken
}
public static function request_by_curl($remote_server,$post_string='')
{
    $ch = curl_init();
    curl_setopt($ch,CURLOPT_URL,$remote_server);
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
    curl_setopt($ch,CURLOPT_CUSTOMREQUEST,"POST");
    curl_setopt($ch,CURLOPT_POSTFIELDS,$post_string);
    curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
    curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,CURLOPT_FOLLOWLOCATION,1);
    curl_setopt($ch,CURLOPT_AUTOREFERER,CURLOPT_HTTPHEADER,array("Expect: "));
    curl_setopt($ch,CURLOPT_USERAGENT,'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
    $content = curl_exec($ch);
    curl_close($ch);
    $reArr=json_decode($content,true);
    return $reArr;
}

2、 合成海报

public function CompositeImage ($ticket,$wxnick,$userId)
{
  $Qrcode = new Imagick("https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=$ticket");
  $Qrcode->setImageResolution(0.1,0.3);   //设置图片分辨率
  $QrcodeWH = $Qrcode->getImageGeometry();  //获取源图片宽和高
  if ($QrcodeWH['width']>200) {
   $QrcodeW['width'] = 200;
   $QrcodeH['height'] = $QrcodeW['width']/$QrcodeWH['width']*$QrcodeWH['height'];
  } else {
   $QrcodeW['width'] = $QrcodeWH['width'];
   $QrcodeH['height'] = $QrcodeWH['height'];
  }
   $Qrcode->thumbnailImage( $QrcodeW['width'],$QrcodeWH['height'],true ); //按照选定的比例进行缩放
  // 预先下载微信头像，再生成合成信息
   $curl  = curl_init($wxnick);
   $wxnickpath = "upload/wxnick/".$userId.".jpg";
   curl_setopt($curl,1);
   $imageData = curl_exec($curl);
   curl_close($curl);
   $tp = @fopen($wxnickpath,'a');
   fwrite($tp,$imageData);
   fclose($tp);
   $weixin = new Imagick($wxnickpath);
   $weixin->setImageResolution(0.1,0.3);
   $weixin->roundCorners(360,360);   //圆角处理
   $wxWH = $weixin->getImageGeometry();
   if ($wxWH['width']>200) {
 $wxW['width'] = 200;
 $wxH['height'] = $wxW['width']/$wxWH['width']*$wxWH['height'];
   } else {
 $wxW['width'] = $wxWH['width'];
 $wxH['height'] = $wxWH['height'];
   }
   $weixin->thumbnailImage( $wxW['width'],$wxWH['height'],true );//等比例缩放
   //创建一个Imagick对象，同时获取要处理的背景图 /data/wenda/htdocs/upload
 $poster = new Imagick( "/data/wenda/htdocs/upload/poster.png" );
 $posterWH = $poster->getImageGeometry();
 $posterW['width'] = $posterWH['width'];
 $posterH['height'] = $posterWH['height'];
 // 按照缩略图大小创建一个有颜色的图片
 $canvas = new Imagick();
 $canvas->newImage( $posterW['width'],$posterH['height'],'black','jpg' );
 //二维码 微信头像 背景 合成
 $poster->compositeImage($Qrcode,Imagick::COMPOSITE_OVER,275,960);
 $poster->compositeImage($weixin,402);
 $canvas->compositeImage( $poster,imagick::COMPOSITE_OVER,0);
 $canvas->setImageCompressionQuality(60); //压缩质量
 $canvas->writeImage( "/upload/poster/$userId.jpg" ); //生成图片
 return $canvas; //返回图片流信息
}
header( "Content-Type: image/jpg" );  //输出图片
$posterimg = $this->CompositeImage($Fticket,$Fwnick,$userId);
echo $posterimg //输出图片

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