在 Laravel 中导出包含大量数据的 PDF

Question

我有下一个代码

$html = '';
foreach ($posts as $post) {
        $html .= '<div class="table-scrollable">
                        <table id="posts" class="table table-bordered table-hover">
                            <thead>
                                <tr>
                                    <th>Id</th>
                                    <th>Name</th>
                                    <th>Title</th>
                                </tr>
                            </thead>
                            <tbody id="body"><tr>
                                <td>'
                . $post->id . ' 
                                </td>
                                <td>' .
                $post->name .
                '</td>
                                <td>'
                . $post->title .
                '</td> 
                    </tr>
                   </tbody>
                </table>
            </div>';
}
return PDF::load($html, 'A4', 'portrait')->download('my_pdf');

问题是当我想下载这么多数据时，我收到下一个错误The localhost page isn’t working localhost is currently unable to handle this request. 但如果我尝试下载例如 20 个条目，则工作正常。我能做什么？

laravel.log

[2016-11-24 13:15:17] 生产。错误：异常'ErrorException' 带有消息“未定义的变量：data_start” /Applications/XAMPP/xamppfiles/htdocs/dicom/app/controllers/IncasariController.php:58 堆栈跟踪：

0 /Applications/XAMPP/xamppfiles/htdocs/dicom/app/controllers/IncasariController.php(58)：

Illuminate\Exception\Handler->handleError(8, '未定义变量...', '/Applications/X...', 58, 数组）

1【内部函数】：IncasariController->filtrareChitante()

2 /Applications/XAMPP/xamppfiles/htdocs/dicom/vendor/laravel/framework/src/Illuminate/Routing/Controller.php(231)：

call_user_func_array(数组，数组)

3 /Applications/XAMPP/xamppfiles/htdocs/dicom/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(93)：

Illuminate\Routing\Controller->callAction('filtrareChitant...', Array)

4 /Applications/XAMPP/xamppfiles/htdocs/dicom/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(62)：

Illuminate\Routing\ControllerDispatcher->call(Object(IncasariController), Object(Illuminate\Routing\Route), 'filtrareChitant...')

5 /Applications/XAMPP/xamppfiles/htdocs/dicom/vendor/laravel/framework/src/Illuminate/Routing/Router.php(962)：

Illuminate\Routing\ControllerDispatcher->dispatch(Object(Illuminate\Routing\Route), 对象（照亮\Http\Request），'IncasariControl...'， 'filtrareChitant...')

6【内部函数】：Illuminate\Routing\Router->Illuminate\Routing{closure}()

7 /Applications/XAMPP/xamppfiles/htdocs/dicom/vendor/laravel/framework/src/Illuminate/Routing/Route.php(109)：

call_user_func_array(Object(Closure), Array)

8 /Applications/XAMPP/xamppfiles/htdocs/dicom/vendor/laravel/framework/src/Illuminate/Routing/Router.php(1028)：

Illuminate\Routing\Route->run(Object(Illuminate\Http\Request))

9 /Applications/XAMPP/xamppfiles/htdocs/dicom/vendor/laravel/framework/src/Illuminate/Routing/Router.php(996)：

Illuminate\Routing\Router->dispatchToRoute(Object(Illuminate\Http\Request))

10 /Applications/XAMPP/xamppfiles/htdocs/dicom/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(775)：

Illuminate\Routing\Router->dispatch(Object(Illuminate\Http\Request))

11 /Applications/XAMPP/xamppfiles/htdocs/dicom/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(745)：

Illuminate\Foundation\Application->dispatch(Object(Illuminate\Http\Request))

12 /Applications/XAMPP/xamppfiles/htdocs/dicom/vendor/laravel/framework/src/Illuminate/Session/Middleware.php(72)：

Illuminate\Foundation\Application->handle(Object(Illuminate\Http\Request), 1、真）

13 /Applications/XAMPP/xamppfiles/htdocs/dicom/vendor/laravel/framework/src/Illuminate/Cookie/Queue.php(47)：

Illuminate\Session\Middleware->handle(Object(Illuminate\Http\Request), 1、真）

14 /Applications/XAMPP/xamppfiles/htdocs/dicom/vendor/laravel/framework/src/Illuminate/Cookie/Guard.php(51)：

Illuminate\Cookie\Queue->handle(Object(Illuminate\Http\Request), 1, 真的）

15 /Applications/XAMPP/xamppfiles/htdocs/dicom/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23)：

Illuminate\Cookie\Guard->handle(Object(Illuminate\Http\Request), 1, 真的）

16 /Applications/XAMPP/xamppfiles/htdocs/dicom/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(641)：

Stack\StackedHttpKernel->handle(Object(Illuminate\Http\Request))

17 /Applications/XAMPP/xamppfiles/htdocs/dicom/public/index.php(49): Illuminate\Foundation\Application->run()

18 {主} [] []

在网页上是：

The localhost page isn’t working

localhost is currently unable to handle this request.

Answer 1

您的代码假设每条记录都有一个 ID、名称和标题。

我会在调用它们之前检查它们是否真的设置了

类似的东西。

foreach ($posts as $post) {

$id= isset($post->id) ? $post->id : 'ID Not Set';
$name= isset($post->name) ? $post->name : 'Name Not Set';
$title= isset($post->title) ? $post->title : ' Title Not Set';

    $html .= '<div class="table-scrollable">
                    <table id="posts" class="table table-bordered table-hover">
                        <thead>
                            <tr>
                                <th>Id</th>
                                <th>Name</th>
                                <th>Title</th>
                            </tr>
                        </thead>
                        <tbody id="body">
                          <tr>
                            <td>'. $id .'</td>
                            <td>'. $name .'</td>
                            <td>'. $title .'</td> 
                          </tr>
               </tbody>
            </table>
        </div>';
}

如果未设置它们可能会导致您的代码失败并出现 Object not found 错误。

您可以从 storage/logs 文件夹中查看您的日志

Answer 2

好吧，您尝试将大型数据集导出为 PDF。我的建议：

1. 尝试制作自定义 CSS 以减少页面负载（您可以将类复制粘贴到自定义 CSS 中）
2. 更改 XAMPP 上 php.ini 的最大执行时间（1 分钟、5 分钟、10 分钟等）