public function createPoster($parmas)
    {

        $content = mb_convert_encoding('这是一张海报', "html-entities", "utf-8");
        $config = array(
            'text'=>array(
                array(
                    'text'=>$content,
                    'left'=>500,
                    'top'=>100,
                    'fontPath'=>'C:\Users\ahuyikao\Desktop\Alibaba-PuHuiTi-Medium.ttf',     //字体文件
                    'fontSize'=>50,             //字号
                    'fontColor'=>'14,14,14',       //字体颜色
                    'angle'=>0,
                )
            ),
            'image'=>array(
                array(
                    'url'=>'./z.png',     //二维码资源
                    'stream'=>0,
                    'left'=>300,
                    'top'=>10,
                    'right'=>0,
                    'bottom'=>0,
                    'width'=>380,
                    'height'=>200,
                    'opacity'=>70
                )
            ),
            'background'=>'https://ahuyikao-pub.cdn.bcebos.com/project/xcx/ahu_dossier/sculptureImg/tmp_31a6762f684d1d232c092f6dd3cdbb6f.jpg'          //背景图
        );
        $filename = './'.time().'.jpg';
//echo createPoster($config,$filename);
        echo $this->createPosters($config);
    }

    public function createPosters($config=array(),$filename=""){

        //如果要看报什么错，可以先注释调这个header
        if(empty($filename)) header("content-type: image/png");
        $imageDefault = array(
            'left'=>0,
            'top'=>0,
            'right'=>0,
            'bottom'=>0,
            'width'=>100,
            'height'=>100,
            'opacity'=>100
        );
        $textDefault = array(
            'text'=>'',
            'left'=>0,
            'top'=>0,
            'fontSize'=>32,       //字号
            'fontColor'=>'255,255,255', //字体颜色
            'angle'=>0,//文字角度 顺时针计算，0 度为水平(由左到右)，90 度则为由下到上的文字；
        );
        $background = $config['background'];//海报最底层得背景
        //背景方法
        $backgroundInfo = getimagesize($background);
        $backgroundFun = 'imagecreatefrom'.image_type_to_extension($backgroundInfo[2], false);
        $background = $backgroundFun($background);
        $backgroundWidth = imagesx($background);  //背景宽度
        $backgroundHeight = imagesy($background);  //背景高度
        $imageRes = imageCreatetruecolor($backgroundWidth,$backgroundHeight);
        $color = imagecolorallocate($imageRes, 0, 0, 0);
        imagefill($imageRes, 0, 0, $color);
//         imageColorTransparent($imageRes, $color);  //颜色透明
        imagecopyresampled($imageRes,$background,0,0,0,0,imagesx($background),imagesy($background),imagesx($background),imagesy($background));
        //处理了图片
        if(!empty($config['image'])){
            foreach ($config['image'] as $key => $val) {
                $val = array_merge($imageDefault,$val);
                $info = getimagesize($val['url']);
                $function = 'imagecreatefrom'.image_type_to_extension($info[2], false);

                $res = $function($val['url']);
                $resWidth = $info[0];
                $resHeight = $info[1];
                //建立画板 ，缩放图片至指定尺寸
                $canvas=imagecreatetruecolor($val['width'], $val['height']);
                imagefill($canvas, 0, 0, $color);
                //关键函数，参数（目标资源，源，目标资源的开始坐标x,y, 源资源的开始坐标x,y,目标资源的宽高w,h,源资源的宽高w,h）
                imagecopyresampled($canvas, $res, 0, 0, 0, 0, $val['width'], $val['height'],$resWidth,$resHeight);
                $val['left'] = $val['left']<0?$backgroundWidth- abs($val['left']) - $val['width']:$val['left'];
                $val['top'] = $val['top']<0?$backgroundHeight- abs($val['top']) - $val['height']:$val['top'];
                //放置图像
                imagecopymerge($imageRes,$canvas, $val['left'],$val['top'],$val['right'],$val['bottom'],$val['width'],$val['height'],$val['opacity']);//左，上，右，下，宽度，高度，透明度
            }
        }

        //处理文字
        if(!empty($config['text'])){
            foreach ($config['text'] as $key => $val) {
                $val = array_merge($textDefault,$val);
                list($R,$G,$B) = explode(',', $val['fontColor']);
                $fontColor = imagecolorallocate($imageRes, $R, $G, $B);
                $val['left'] = $val['left']<0?$backgroundWidth- abs($val['left']):$val['left'];
                $val['top'] = $val['top']<0?$backgroundHeight- abs($val['top']):$val['top'];
                imagettftext($imageRes,$val['fontSize'],$val['angle'],$val['left'],$val['top'],$fontColor,$val['fontPath'],$val['text']);
            }
        }



        //生成图片
        if(!empty($filename)){
            $res = imagejpeg ($imageRes,$filename,90); //保存到本地
            imagedestroy($imageRes);
            if(!$res) return false;
            return $filename;
        }else{
            imagejpeg ($imageRes);     //在浏览器上显示
            imagedestroy($imageRes);
        }
    }

效果图如下

一定要注意字体路径，字体路径不对的话，文字一直写不上去。