PHP 图片+文字+二维码生成小程序分享海报

思路：

1、请求微信接口获取一定尺寸微信二维码

2、准备海报主图，处理尺寸按比例缩放

3、准备分享语录，计算段落高度

4、生成海报：创建画布，分写别入按顺序和位置写入二维码、图片、文字等

5、保存海报

具体如下：

1、请求微信接口获取一定尺寸微信二维码

$access_token = 'jkagfgjkdahfgadhsfkdsj';
$url = sprintf("https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=%s",$access_token);
$postdata = '{"path": "/pages/subActivity/pages/activityDetail/activityDetail?id='.$id.'", "width": 210}';

//微信的二维码
$image = http_post($url,$postdata);

//准备微信二维码以备生成海报使用

$wxim = imagecreatefromstring($image);
$wxim_size = 270;

function http_post($url = '', $param = '') {
    if (empty($url) || empty($param)) {
        return false;
    }

    $postUrl = $url;
    $curlPost = $param;
    $ch = curl_init();//初始化curl
    curl_setopt($ch, CURLOPT_URL,$postUrl);//抓取指定网页
    curl_setopt($ch, CURLOPT_HEADER, 0);//设置header
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);//要求结果为字符串且输出到屏幕上
    curl_setopt($ch, CURLOPT_POST, 1);//post提交方式
    curl_setopt($ch, CURLOPT_POSTFIELDS, $curlPost);
    $data = curl_exec($ch);//运行curl
    curl_close($ch);

    return $data;
}

2、准备海报主图，处理尺寸按比例缩放

$share_img = '图片路径'
$share_img_size = getimagesize($share_img); //图片尺寸
$shareim = imagecreatefromstring(file_get_contents($share_img));
//计算原图长宽比例
$size_rate = $share_img_size[1]/$share_img_size[0];

//新图尺寸
$share_img_width = 450;
$share_img_height = intval($share_img_width*$size_rate);

//复制生成新图并保存
$new_share_img = imagecreatetruecolor($share_img_width, $share_img_height);
imagecopyresampled($new_share_img, $shareim, 0, 0, 0, 0,$share_img_width,$share_img_height,$share_img_size[0], $share_img_size[1]);
$new_share_img_filename = $dir.'/'.$id.'_new_share.jpg';
imagejpeg($new_share_img, $new_share_img_filename);
imagedestroy($new_share_img);

//准备可写入新分享主图 以备生成海报使用
$new_shareim = imagecreatefromstring(file_get_contents($dir.'/'.$id.'_new_share.jpg'));

unlink($new_share_img_filename); //删除临时新的分享图

3、准备分享语录文字，计算高度

 //准备分享语录
 $content = "";
 // 将字符串拆分成一个个单字 保存到数组 letter 中
 for ($i=0;$i<mb_strlen($share_title);$i++) {
     $letter[] = mb_substr($share_title, $i, 1);
 }

 foreach ($letter as $l) {
     $teststr = $content." ".$l;
     $share_title_size = imagettfbbox(16, 0, $font, $teststr);
     // 判断拼接后的字符串是否超过预设的宽度
     if (($share_title_size[2] > $share_img_width) && ($content !== "")) {
           $content .= "\n";
     }
     $content .= $l;
 }
　//文字高度
 $share_title_height = $share_title_size[3];

4、生成海报：创建画布，分写别入按顺序和位置写入二维码、图片、文字等

//生成海报
                

$font = FCPATH.'/styles/font/wryh.ttf';   //保证字体文件目录正确

$filepath = $dir.'/'.$id.'_p.jpg';
$posters_width = 510;
$posters_height = 130 + $share_img_height+$share_title_height + 280;

$newimg = imagecreatetruecolor($posters_width, $posters_height);
$bg = imagecolorallocate($newimg, 255, 255, 255);
imagefill($newimg,0,0,$bg);
$black = imagecolorallocate($newimg, 0, 0, 0);

//写宣传言
imagettftext($newimg,18,0,30,47,$black,$font,'美好生活');
imagettftext($newimg,15,0,30,76,$black,$font,'关注美好生活了解社区好生活');

//写分享图片
imagecopy($newimg,$new_shareim,30,95,0,0,$share_img_width,$share_img_height);

//写分享标题
imagettftext ($newimg, 15, 0, 30, $share_img_height+122, $black, $font, $content );

//写二维码
$wxim_start_hight = 130+$share_title_height+$share_img_height;
imagecopy($newimg,$wxim,20,$wxim_start_hight,0,0,$wxim_size,$wxim_size);

$gray = imagecolorallocate($newimg, 136, 136, 136);

//写提示语
$tips = '长按保存海报至手机相册';
$tips_hight = $wxim_start_hight+200;
imagettftext($newimg,13,0,290,$tips_hight,$gray,$font,$tips);

//海报生成保存
imagejpeg($newimg, $filepath);
ImageDestroy($newimg);
ImageDestroy($wxim);

整体代码

    　　　　　$access_token = '请求微信接口的aceess_token';
            if($access_token){
                $url = sprintf("https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=%s",$access_token);
                $postdata = '{"path": "/pages/subActivity/pages/activityDetail/activityDetail?id='.$id.'", "width": 210}';

                //微信的二维码
                $image = http_post($url,$postdata);
                if(strlen($image) < 200){ //出错了
                    log_message('error',"getTopicQRCodeProcessed, error : " . $image);
                    //刷新token
                    ls('wx_service');
                    $this->wx_service->refreshToken();
                    return false;
                }

                $dir = FCPATH.'upload/qrcode/'.date('Ym');
                MkFolder($dir);
                $path = $dir.'/'.$id.'.jpg';
                file_put_contents($path,$image);
                $qrcode = pathATOR($path);

                $share_title = element('share_title',$event);
                $share_img = element('share_img_moment',$event) ? : element('cover',$event);
                $share_img = get_oss_file_url($share_img);
                $font = FCPATH.'/styles/font/wryh.ttf';

                //准备分享图片  先处理图片尺寸
                $share_img_size = getimagesize($share_img);
                $shareim = imagecreatefromstring(file_get_contents($share_img));
                $size_rate = $share_img_size[1]/$share_img_size[0];
                $share_img_width = 450;
                $share_img_height = intval($share_img_width*$size_rate);
                $new_share_img = imagecreatetruecolor($share_img_width, $share_img_height);
                imagecopyresampled($new_share_img, $shareim, 0, 0, 0, 0,$share_img_width,$share_img_height,$share_img_size[0], $share_img_size[1]);
                $new_share_img_filename = $dir.'/'.$id.'_new_share.jpg';
                imagejpeg($new_share_img, $new_share_img_filename);
                imagedestroy($new_share_img);

                $new_shareim = imagecreatefromstring(file_get_contents($dir.'/'.$id.'_new_share.jpg'));

                unlink($new_share_img_filename);
                //准备分享标题
                $content = "";
                // 将字符串拆分成一个个单字 保存到数组 letter 中
                for ($i=0;$i<mb_strlen($share_title);$i++) {
                    $letter[] = mb_substr($share_title, $i, 1);
                }

                foreach ($letter as $l) {
                    $teststr = $content." ".$l;
                    $share_title_size = imagettfbbox(16, 0, $font, $teststr);
                    // 判断拼接后的字符串是否超过预设的宽度
                    if (($share_title_size[2] > $share_img_width) && ($content !== "")) {
                        $content .= "\n";
                    }
                    $content .= $l;
                }
                $share_title_height = $share_title_size[3];

                //准备微信二维码
                $wxim = imagecreatefromstring($image);
                $wxim_size = 270;

                //生成海报
                $filepath = $dir.'/'.$id.'_p.jpg';
                $posters_width = 510;
                $posters_height = 130 + $share_img_height+$share_title_height + 280;

                $newimg = imagecreatetruecolor($posters_width, $posters_height);
                $bg = imagecolorallocate($newimg, 255, 255, 255);
                imagefill($newimg,0,0,$bg);
                $black = imagecolorallocate($newimg, 0, 0, 0);

                //写宣传言
                imagettftext($newimg,18,0,30,47,$black,$font,'昌品生活');
                imagettftext($newimg,15,0,30,76,$black,$font,'关注昌品生活了解社区好生活');

                //写分享图片
                imagecopy($newimg,$new_shareim,30,95,0,0,$share_img_width,$share_img_height);

                //写分享标题
                imagettftext ($newimg, 15, 0, 30, $share_img_height+122, $black, $font, $content );

                //写二维码
                $wxim_start_hight = 130+$share_title_height+$share_img_height;
                imagecopy($newimg,$wxim,20,$wxim_start_hight,0,0,$wxim_size,$wxim_size);

                $gray = imagecolorallocate($newimg, 136, 136, 136);

                //写提示语
                $tips = '长按保存海报至手机相册';
                $tips_hight = $wxim_start_hight+200;
                imagettftext($newimg,13,0,290,$tips_hight,$gray,$font,$tips);

                //海报生成保存
                imagejpeg($newimg, $filepath);
                ImageDestroy($newimg);
                ImageDestroy($wxim);
                $posters = pathATOR($filepath);