PHP使用 Imagick 扩展实现图片合成，圆角处理功能

本文讲述了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($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
  curl_setopt($ch, CURLOPT_AUTOREFERER, 1);
  curl_setopt($ch, 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,CURLOPT_RETURNTRANSFER,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,Imagick::COMPOSITE_OVER,275,402);
$canvas->compositeImage( $poster, imagick::COMPOSITE_OVER, 0, 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

更多关于PHP相关内容感兴趣的读者可查看本站专题：《PHP扩展开发教程》、《PHP网络编程技巧总结》、《php curl用法总结》、《PHP数组(Array)操作技巧大全》、《PHP图形与图片操作技巧汇总》及《php字符串(string)用法总结》

希望本文所述对大家PHP程序设计有所帮助。

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