从数据库下载Php文件返回html而不是实际文件

Question

我试图从我的数据库下载文件，其数据存储为blob。但是，我的代码不断返回html文件而不是实际文件。

更糟糕的是，输出的名称是＆＃39; handleDownload＆＃39;这是我的php下载脚本的名称，而不是实际的文件名！

我该如何解决这个问题？提前谢谢！

这是我一直关注的教程：http://www.w3programmers.com/file-upload-and-download-with-php/

下载代码

<?php 
$Download = new Download();
$result = array(); //store results of output
try {
    //if id is set then get file from database
    if(isset($_GET['id'])){ 
      $id = $_GET['id'];
      //pump id in to function getDBFiles to pull file with matching id
      $Download->getDBFiles($id);
      //get array containing file details from function getDBFiles
      $getFiles = $Download->getMessages();
      $size = $getFiles['size'];
      $type = $getFiles['type'];
      $name = $getFiles['name'];
      $content = $getFiles['content'];
      header("Content-length: $size");
      header("Content-type: $type");
      header("Content-Disposition: attachment; filename=$name");
      echo $content; exit;
    }
    //execute retrieval of files from database
    $Download->showDBFiles();
    //pass results to output array 
    $output = $Download->getMessages();
    //var_dump($output);
} catch (Exception $e) {
    $result[] = $e->getMessage();
}

?>

数据库代码

 protected $messages = array();
 public function showDBFiles() {
     global $database;
     $sql = "SELECT resume_id, resume_title FROM ".self::$table_name;
     $result = $database->query($sql);
     if(mysqli_num_rows($result)==0){
         $this->messages[] = "Database is empty";
     }else{
           while(list($id, $name) = mysqli_fetch_array($result)){
                  $this->messages[] = array('id'=>$id, 'name'=>$name);
          }

    }
}

public function getDBFiles($id) {
    global $database;
    $sql = "SELECT resume_title, file_type, file_size,resume_data FROM  ".self::$table_name." WHERE resume_id = $id";
    $result = $database->query($sql);
    list($name, $type, $size, $content) = mysqli_fetch_array($result);
            $this->messages[] = array('name'=>$name, 'type'=>$type, 'size'=>$size, 'content'=>$content);        
        }

public function getMessages()
{
  return $this->messages;
}