为什么每次点击下载都会在同一个文件夹中创建一个空的pdf文件？

问题描述

我试图在我的网站上强制下载 pdf 文件。文件已成功下载，但在单击下载时会在同一文件夹中创建一个随机名称的空文件。我在文件夹中有多个空文件。

下载.PHP :

<?PHP

    $file = $_GET['file'];    
    header('Content-type: application/pdf');
    header('Content-Length: ' . filesize($file));  
    header('Content-disposition: attachment; filename="'.$file.'"');                     

?>

解决方法

假设您将 pdf 存储在数据库中。

<div class="wrapper">
  <div class="jumbotron">
    <h1 class="display-4">The Truth Is Out There</h1>
  </div>
  <div class="container-fluid">
    <div class="row">
      <div class="container-fluid">
        <div class="row">
          <div class="col-md-3">
            <form class="bg-dark">
              <p>Filter Search</p>
              <ul class="list-group bg-dark">
                <li class="list-group-item bg-dark">
                  <label for="date">Enter Date</label>
                  <input type="text" placeholder="1/10/2010" id="datetime" />
                </li>
                <li class="list-group-item bg-dark">
                  <label for="city">Enter a City</label>
                  <input type="text" placeholder="roswell" id="city">
                </li>
                <li class="list-group-item bg-dark">
                  <label for="state">Enter a State</label>
                  <input type="text" placeholder="ca" id="state">
                </li>
                <li class="list-group-item bg-dark">
                  <label for="Country">Enter a Country</label>
                  <input type="text" placeholder="us" id="country">
                </li>
                <li class="list-group-item bg-dark">
                  <label for="Shape">Enter a Shape</label>
                  <input type="text" placeholder="crcle" id="shape">
                </li>
                <li class="list-group-item bg-dark">
                  <button id="filter-btn" type="button" class="btn btn-dark">Clear Table</button>
                </li>
              </ul>
            </form>

          </div>
          <div class="col-md-9">
            <table class="table table-striped">
              <thead>              
                <tr>
                  <th>Date</th>
                  <th>City</th>
                  <th>State</th>
                  <th>Country</th>
                  <th>Shape</th>
                  <th>Duration</th>
                  <th>Comments</th>
                </tr>
              </thead>
              <tbody></tbody>
            </table>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

请注意，如果您在此之前发送了一些标题，它将无法正常工作。

确保您正确创建了 pdf 文件。

        //you need to decode
        $decoded = base64_decode($downloaded->pdf);
        //name of pdf
        $filename =date('Ymdhis').'.pdf';
        $size=strlen($decoded);
           


            header('Content-Description: File Transfer');
            header('Content-Type: application/pdf');
            header('Content-Disposition: attachment; filename="'.($filename).'"');
            header("Content-Transfer-Encoding: binary");
            header('Expires: 0');
            header("Cache-Control: no-cache,must-revalidate");
            header("Pragma: no-cache");
            header('Content-Length:'.$size);
            echo($decoded);
            exit;