PHP实现图片合并的示例详解

//微信小程序 小程序码
    public static function getwechatsmallprogramcode($scene)
    {
        $accesstoken = self::getaccesstoken();
        $url = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=" . $accesstoken;
        $postdata = [
            'scene' => $scene,
            'page' => 'pages/index/index',
            'width'=>930
        ];
        $postdata = json_encode($postdata);
        $contentdata = self::sendpost($url, $postdata);
        return $contentdata; //如果图片大小符合这开启base64位图片地址也可以完成图片的合并合文字的合并
//        return self::base64urlcode($contentdata, 'image/png');
    }

    protected static function sendpost($url, $post_data)
    {
        $options = array(
            'http' => array(
                'method' => 'post',
                'header' => 'content-type:application/json',
                //header 需要设置为 json
                'content' => $post_data,
                'timeout' => 60
                //超时时间
            )
        );
        $context = stream_context_create($options);
        return file_get_contents($url, false, $context);
    }

    //二进制转图片image/png
    public static function base64urlcode($contents, $mime)
    {
        $base64 = base64_encode($contents);
        return ('data:' . $mime . ';base64,' . $base64);
    }

/**
     * 缩放图片尺寸
     * @param $img_path string 图片地址
     * @param $new_width
     * @param $new_height
     * @param $new_img_path string 新的图片地址
     */
    public static function piczoom($img_path,$new_width,$new_height,$new_img_path)
    {
        //获取尺寸
        list($width, $height, $img_type, $attr) = getimagesize($img_path);
        $imageinfo = [
            'width' => $width,
            'height' => $height,
            'type' => image_type_to_extension($img_type, false),
            'attr' => $attr
        ];
        $fun = "imagecreatefrom" . $imageinfo['type'];
        $image = $fun($img_path);
        //创建新的幕布
        $image_thump = imagecreatetruecolor($new_width, $new_height);
        //复制源文件
        imagecopyresampled($image_thump, $image, 0, 0, 0, 0, $new_width, $new_height, $imageinfo['width'], $imageinfo['height']);
        imagedestroy($image);

        $image = $image_thump;
        $func = 'image' . $imageinfo['type'];
        $func($image, $new_img_path);
    }

/**
     * 图片合并
     * 将源图片覆盖到目标图片上
     * @param string $dstpath 目标图片路径 背景图
     * @param string $srcpath 源图片路径   内容图
     * @param int $dstx 源图片覆盖到目标的x轴坐标
     * @param int $dsty 源图片覆盖到目标的y轴坐标
     * @param int $srcx
     * @param int $srcy
     * @param int $pct 透明度
     * @param string $filename 输出的文件名，为空则直接在浏览器上输出显示
     * @return string $filename 合并后的文件名
     */
    public static function picmerge($dstpath, $srcpath, $dstx = 0, $dsty = 0, $srcx = 0, $srcy = 0, $pct = 100, $filename = '')
    {
        //创建图片的实例
        $dst = imagecreatefromstring(file_get_contents($dstpath));
        $src = imagecreatefromstring(file_get_contents($srcpath));
        //获取水印图片的宽高
        list($src_w, $src_h) = getimagesize($srcpath);
        //将水印图片复制到目标图片上，最后个参数50是设置透明度，这里实现半透明效果
//        imagecopymerge($dst, $src, 80, 125, 0, 0, $src_w, $src_h, 100);
        imagecopymerge($dst, $src, $dstx, $dsty, $srcx, $srcy, $src_w, $src_h, $pct);
        //如果水印图片本身带透明色，则使用imagecopy方法
        //imagecopy($dst, $src, 10, 10, 0, 0, $src_w, $src_h);
        //输出图片
        list($dst_w, $dst_h, $dst_type) = getimagesize($dstpath);
        switch ($dst_type) {
            case 1://gif
                if (!$filename) {
                    header('content-type: image/gif');
                    imagegif($dst);
                } else {
                    imagegif($dst, $filename);
                }
                break;
            case 2://jpg
                if (!$filename) {
                    header('content-type: image/jpeg');
                    imagejpeg($dst);
                } else {
                    imagejpeg($dst, $filename);
                }
                break;
            case 3://png
                if (!$filename) {
                    header('content-type: image/png');
                    imagepng($dst);
                } else {
                    imagepng($dst, $filename);
                }
                break;
            default:
                break;
        }
        imagedestroy($dst);
        imagedestroy($src);
    }

/**
     *  添加文字到图片上
     * @param $dstpath string 目标图片
     * @param $fontpath string 字体路径
     * @param $fontsize string 字体大小
     * @param $text string 文字内容
     * @param $dsty string 文字y坐标值
     * @param string $filename 输出文件名，为空则在浏览器上直接输出显示
     * @return string 返回文件名
     */
    public static function addfonttopic($dstpath, $fontpath, $fontsize, $text, $dsty, $filename = '')
    {
        ob_end_clean();

        //创建图片的实例
        $dst = imagecreatefromstring(file_get_contents($dstpath));
        //打上文字
        $fontcolor = imagecolorallocate($dst, 255, 255, 255);//字体颜色
        $width = imagesx($dst);
        $height = imagesy($dst);
        $fontbox = imagettfbbox($fontsize, 0, $fontpath, $text);//文字水平居中实质
        imagettftext($dst, $fontsize, 0, ceil(($width - $fontbox[2]) / 2), $dsty, $fontcolor, $fontpath, $text);
        //输出图片
        list($dst_w, $dst_h, $dst_type) = getimagesize($dstpath);
        switch ($dst_type) {
            case 1://gif
                if (!$filename) {
                    header('content-type: image/gif');
                    imagegif($dst);
                } else {
                    imagegif($dst, $filename);
                }
                break;
            case 2://jpg
                if (!$filename) {
                    header('content-type: image/jpeg');
                    imagejpeg($dst);
                } else {
                    imagejpeg($dst, $filename);
                }
                break;
            case 3://png
                if (!$filename) {
                    header('content-type: image/png');
                    imagepng($dst);
                } else {
                    imagepng($dst, $filename);
                }
                break;
            default:
                break;
        }
        imagedestroy($dst);
        return $filename;
    }

/**
     * 根据店铺id 和名称 合成a5 图片小程序图片
     * @param $shop_id
     * @param $shop_name
     * @return array
     */
    public static function generatewechatappletimage($shop_id, $shop_name)
    {
        //1 生成小程序码
        //2 合成小程序码到背景图片
        $scenestr = '?shop_id=' . $shop_id;
        $wechatappimgbasedata = wxtools::getwechatsmallprogramcode($scenestr);
        $wechatappimgpath = './wechatappimg/shop_code_' . $shop_id . '.jpg';
        file_put_contents($wechatappimgpath, $wechatappimgbasedata);

        //合并到背景图片中
        $beijinimgpath = './wechatappimg/wechatbj.jpg';
        $mergeimgfile = './wechatappimg/shop_mini_program' . $shop_id . '.jpg';
        generatecodeimg::picmerge($beijinimgpath, $wechatappimgpath, 408, 714, $srcx = 0, $srcy = 0, $pct = 100, $mergeimgfile);

        //3 合成文字
        $fontpath = './plus/fonts/sourcehansanscn-bold.ttf';
        $fontsize = 40;
        $dsty = 640;
        generatecodeimg::addfonttopic($mergeimgfile, $fontpath, $fontsize, $shop_name, $dsty, $mergeimgfile);

        $wechatcodeimgurl = \yii::$app->request->hostinfo . '/wechatappimg/shop_code_' . $shop_id . '.jpg';
        $wechatappimgurl = \yii::$app->request->hostinfo . '/wechatappimg/shop_mini_program' . $shop_id . '.jpg';
        return [
            'wechatcodeimgurl' => $wechatcodeimgurl,
            'wechatappimgurl' => $wechatappimgurl,
        ];
    }