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  • PHP 生成自定义海报,自定义二维码

    前言:关于php生成自定义海报,网上的教程一搜一大片,但是当你真正用到的时候,似乎没有一个好使的,这样致使生成海报一直是我的一个难点,我也懒得时间去搞这些东西,然后时间一拖就拖了两年,今年客户有类似的需求,想着今天就整理整理吧

    1. 生成海报首先要明白他是怎么生成的,其实很简单,就是用画布把多张图片组合起来,然后在和背景图组合起来就生成海报了,所以您有必要了解一下必知的画布函数
    • imagecreatetruecolor 创建背景画布
    • imagecreatefromstring 创建一个图像资源从字符串中的图像流。

    扩展
    imagecreate — 新建一个基于调色板的图像

    imagecreatetruecolor — 新建一个真彩色图像

    imagecreatefromstring — 创建一个图像资源从字符串中的图像流。

    $data = 'iVBORw0KGgoAAAANSUhEUgAAABwAAAASCAMAAAB/2U7WAAAABl'
          . 'BMVEUAAAD///+l2Z/dAAAASUlEQVR4XqWQUQoAIAxC2/0vXZDr'
          . 'EX4IJTRkb7lobNUStXsB0jIXIAMSsQnWlsV+wULF4Avk9fLq2r'
          . '8a5HSE35Q3eO2XP1A1wQkZSgETvDtKdQAAAABJRU5ErkJggg==';
    $data = base64_decode($data);
    
    $im = imagecreatefromstring($data);
    if ($im !== false) {
       header('Content-Type: image/png');
       imagepng($im);
    }
    else {
       echo 'An error occured.';
    }
    
    • imagecopy将图片绘制到画布上http://www.5idev.com/p-php_imagecopy_imagecopyresized.shtml
    • imagedestroy释放与关联图片的内存
    • imagesx imagesy获取头像的宽高
    • imagecopyresized拷贝图片
    • imagecolorallocate()设置图像颜色,多用于绘制文字的颜色
    • imagettftext绘制文字
    • imagepng输出图像
    1. 然后第二步我们就需要用到一个插件phpqrcode
      关于phpqrcode其实就是php生成二维码的一个插件,方便快捷

    require_once IA_ROOT . '/framework/library/qrcode/phpqrcode.php';
    
    首先我们先用phpqrcode做一个生成二维码的方法接口

    public function createQrcode($mid = 0, $posterid = 0)
        {
            global $_W;
            global $_GPC;
            $path = IA_ROOT . '/addons/ewei_shopv2/data/qrcode/' . $_W['uniacid'] . '/';
    
            if (!is_dir($path)) {
                load()->func('file');
                mkdirs($path);
            }
    
            $url = mobileUrl('', array('mid' => $mid), true);
    
            if (!empty($posterid)) {
                $url .= '&posterid=' . $posterid;
            }
    
            $file = 'shop_qrcode_' . $posterid . '_' . $mid . '.png';
            $qrcode_file = $path . $file;
    
            if (!is_file($qrcode_file)) {
                require_once IA_ROOT . '/framework/library/qrcode/phpqrcode.php';
                QRcode::png($url, $qrcode_file, QR_ECLEVEL_L, 4);
            }
    
            return $_W['siteroot'] . 'addons/ewei_shopv2/data/qrcode/' . $_W['uniacid'] . '/' . $file;
        }
    
    第二步调用上面的接口生成一个可以扫描的二维码,然后下面做背景图,字合成,然后也是先写一个接口,方面咱们后期直接复制使用
    • 创建图片(图片流,比如base64转换)

    public function createImage($imgurl)
        {
            load()->func('communication');
            $resp = ihttp_request($imgurl);
            if ($resp['code'] == 200 && !empty($resp['content'])) {
                return imagecreatefromstring($resp['content']);
            }
    
            $i = 0;
    
            while ($i < 3) {
                $resp = ihttp_request($imgurl);
                if ($resp['code'] == 200 && !empty($resp['content'])) {
                    return imagecreatefromstring($resp['content']);
                }
    
                ++$i;
            }
    
            return '';
        }
    
    • 处理图像px

    public function getRealData($data)
        {
            $data['left'] = intval(str_replace('px', '', $data['left'])) * 2;
            $data['top'] = intval(str_replace('px', '', $data['top'])) * 2;
            $data['width'] = intval(str_replace('px', '', $data['width'])) * 2;
            $data['height'] = intval(str_replace('px', '', $data['height'])) * 2;
            $data['size'] = intval(str_replace('px', '', $data['size'])) * 2;
            $data['src'] = tomedia($data['src']);
            return $data;
        }
    
    • 拷贝图片和制作文字的接口

    public function mergeImage($target, $data, $imgurl)
        {
            $img = $this->createImage($imgurl);
            $w = imagesx($img);
            $h = imagesy($img);
            imagecopyresized($target, $img, $data['left'], $data['top'], 0, 0, $data['width'], $data['height'], $w, $h);
            imagedestroy($img);
            return $target;
        }
        
        public function mergeText($target, $data, $text)
        {
            $font = IA_ROOT . '/addons/ewei_shopv2/static/fonts/msyh.ttf';
            $colors = $this->hex2rgb($data['color']);
            $color = imagecolorallocate($target, $colors['red'], $colors['green'], $colors['blue']);
            imagettftext($target, $data['size'], 0, $data['left'], $data['top'] + $data['size'], $color, $font, $text);
            return $target;
        }
    
    • 上传图片

    public function uploadImage($img)
        {
            load()->func('communication');
            $account = m('common')->getAccount();
            $access_token = $account->fetch_token();
            $url = 'http://file.api.weixin.qq.com/cgi-bin/media/upload?access_token=' . $access_token . '&type=image';
            $ch1 = curl_init();
            $data = array('media' => '@' . $img);
    
            if (version_compare(PHP_VERSION, '5.5.0', '>')) {
                $data = array('media' => curl_file_create($img));
            }
    
            curl_setopt($ch1, CURLOPT_URL, $url);
            curl_setopt($ch1, CURLOPT_POST, 1);
            curl_setopt($ch1, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch1, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($ch1, CURLOPT_SSL_VERIFYHOST, false);
            curl_setopt($ch1, CURLOPT_POSTFIELDS, $data);
            $content = @json_decode(curl_exec($ch1), true);
    
            if (!is_array($content)) {
                $content = array('media_id' => '');
            }
    
            curl_close($ch1);
            return $content['media_id'];
        }
    

    总,然后调用接口

        
        public function createPoster($poster, $member, $qr, $upload = true)
        {
            //$poster  海报信息   $qr 二维码
            global $_W;
            $path = IA_ROOT . '/addons/ewei_shopv2/data/poster/' . $_W['uniacid'] . '/';
    
            if (!is_dir($path)) {
                load()->func('file');
                mkdirs($path);
            }
    
        
            $md5 = md5(json_encode(array('siteroot' => $_W['siteroot'], 'openid' => $member['openid'], 'goodsid' => $qr['goodsid'], 'bg' => $poster['bg'], 'data' => $poster['data'], 'version' => 1)));
            
            $file = $md5 . '.png';
            
            
            if (!is_file($path . $file) || $qr['qrimg'] != $qr['current_qrimg']) {
                //突破256M的限制
                set_time_limit(0);
                @ini_set('memory_limit', '256M');
                
                $target = imagecreatetruecolor(640, 1008);
                
                $bg = $this->createImage(tomedia($poster['bg']));
                imagecopy($target, $bg, 0, 0, 0, 0, 640, 1008);
                imagedestroy($bg);
                $data = json_decode(str_replace('&quot;', '\'', $poster['data']), true);
    
                foreach ($data as $d) {
                    $d = $this->getRealData($d);
    
                    if ($d['type'] == 'head') {
                        $avatar = preg_replace('/\\/0$/i', '/96', $member['avatar']);
                        $target = $this->mergeImage($target, $d, $avatar);
                    }
                    else if ($d['type'] == 'img') {
                        $target = $this->mergeImage($target, $d, $d['src']);
                    }
                    else if ($d['type'] == 'qr') {
                        $target = $this->mergeImage($target, $d, tomedia($qr['current_qrimg']));
                    }
                    else if ($d['type'] == 'nickname') {
                        $target = $this->mergeText($target, $d, $member['nickname']);
                    }
                    else {
                        if (!empty($goods)) {
                            if ($d['type'] == 'title') {
                                $title_width = (int) ($d['width'] / $d['size'] / 1.2);
                                $width_left = 0;
    
                                while ($width_left < strlen($goods['title'])) {
                                    $title = mb_substr($goods['title'], $width_left, $title_width, 'utf-8');
                                    $width_left += $title_width;
                                    $d['top'] += $d['size'] * 2;
                                    $target = $this->mergeText($target, $d, $title);
                                }
                            }
                            else if ($d['type'] == 'thumb') {
                                $thumb = !empty($goods['commission_thumb']) ? tomedia($goods['commission_thumb']) : tomedia($goods['thumb']);
                                $target = $this->mergeImage($target, $d, $thumb);
                            }
                            else if ($d['type'] == 'marketprice') {
                                $target = $this->mergeText($target, $d, $goods['marketprice']);
                            }
                            else {
                                if ($d['type'] == 'productprice') {
                                    $target = $this->mergeText($target, $d, $goods['productprice']);
                                }
                            }
                        }
                    }
                }
    
                imagepng($target, $path . $file);
                imagedestroy($target);
    
                if ($qr['qrimg'] != $qr['current_qrimg']) {
                    pdo_update('ewei_shop_poster_qr', array('qrimg' => $qr['current_qrimg']), array('id' => $qr['id']));
                }
            }
    
            $img = $_W['siteroot'] . 'addons/ewei_shopv2/data/poster/' . $_W['uniacid'] . '/' . $file;
    
            if (!$upload) {
                return $img;
            }
    
            if ($qr['qrimg'] != $qr['current_qrimg'] || empty($qr['mediaid']) || empty($qr['createtime']) || $qr['createtime'] + 3600 * 24 * 3 - 7200 < time()) {
                $mediaid = $this->uploadImage($path . $file);
                $qr['mediaid'] = $mediaid;
                pdo_update('ewei_shop_poster_qr', array('mediaid' => $mediaid, 'createtime' => time()), array('id' => $qr['id']));
            }
    
            return array('img' => $img, 'mediaid' => $qr['mediaid']);
        }
    
    

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