thinkPHP5 生成海报（图片叠加定位）

放在common.php文件中

function getbgqrcode($imageDefault,$textDefault,$background,$filename="",$config=array()){
    //如果要看报什么错，可以先注释调这个header
    if(empty($filename)) header("content-type: image/png");
    //背景方法
    $backgroundInfo = getimagesize($background);
    $ext = image_type_to_extension($backgroundInfo[2], false);
    $backgroundFun = 'imagecreatefrom'.$ext;
    $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, $color);
    imagecopyresampled($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);
           /* if($val['stream']){   
                //如果传的是字符串图像流
                $info = getimagesizefromstring($val['url']);
                $function = 'imagecreatefromstring';
            }*/
            $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']);
        }
    }
   // $filename = '/uploads/haibao/' . time().mt_rand(1000,9999).'.png';
    //生成图片
    if(!empty($filename)){
        $res = imagejpeg ($imageRes,$filename,90); 
        //保存到本地
        imagedestroy($imageRes);
    }else{
        imagejpeg ($imageRes);     
        //在浏览器上显示
        imagedestroy($imageRes);
    }
}

在控制器中 放入一下代码
做了一个文件替换 生成新图 没做出来 等下次用的时候 修改一下

/*生成海报*/
    public function get_poster($poster,$erwei){
        //$erwei = $erwei;
        //  $erwei = ROOT_PATH . 'public'.$erwei;
        $poster = substr($poster, 1);
        //dump($erwei);die;
        $imageDefault = array(
            'left'=>250,
            'top'=>560,
            'right'=>0,
            'bottom'=>0,
            'width'=>250,
            'height'=>250,
            'opacity'=>100
        );
        $textDefault = array(
            'text'=>'',
            'left'=>0,
            'top'=>0,
            'fontSize'=>32,       //字号
            'fontColor'=>'255,255,255', //字体颜色
            'angle'=>0,
        );
        $background = ROOT_PATH . '/public/hb.png';//海报最底层得背景
        $config['image'][]['url'] = ROOT_PATH . 'public'.$erwei;
        $filename =  $poster;
        //$filename = '/uploads/haibao/' . time().mt_rand(1000,9999).'.png';
        getbgqrcode($imageDefault,$textDefault,$background,$filename,$config);
        return $filename;
        //echo "";
    }