在设置内容类型标题之前PHP回显?

时间:2014-07-15 09:06:04

标签: php http-headers

我有以下PHP代码:

function download_file($file, $description=null, $filename=false){
    $filename = $filename || basename($file);
    ob_start();
    if(is_string($description)){
        $description = preg_replace("/\$1/", $filename, $description);
        echo $description;
    }
    sleep(2);
    header('Content-Type: '.$this->file_mimetype($file));
    header("Content-Transfer-Encoding: Binary"); 
    header("Content-disposition: attachment; filename=\"" . basename($file) . "\""); 
    readfile($file);
    header("Content-Type: text/html");
    ob_end_flush();
}
download_file("https://raw.githubusercontent.com/Gethis/ED/master/easydevop.class.php", "Downloading easydevop.class.php");

问题是它在下载之前没有回复“下载easydevop.class.php”。我也尝试在所有标题之后回显它,但这也不起作用。请帮忙吗?

如您所见,我确实使用了ob_start()ob_end_flush()

2 个答案:

答案 0 :(得分:1)

你不能使用" echo" (显示HTML内容)并同时向用户发送文件。 您可以先显示HTML页面,然后使用将用户重定向到该文件 HTML重定向

<META HTTP-EQUIV="REFRESH" CONTENT="0;URL=http://url.to/file/or_script/that_send_file/">

或javascript重定向How do I redirect with Javascript?

答案 1 :(得分:0)

正如我已经提到的,下载文件时无法显示回显。下载文件时,您只需下载文件即可。

但是,使用JavaScript可以在开始下载之前显示消息。这是测试脚本:

<?php
if (isset($_GET['id'])) { 
    $file = 'testfile.txt';
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename='.basename($file));
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file));
    readfile($file);
    exit;         
}
?>

<!DOCTYPE html>
<html>
<head>
       <meta charset="utf-8" />
</head>
<body>

  <script type="text/javascript">
  function showDownload(message) {
       document.getElementById("hidden").innerHTML  = message;
       document.getElementById("link1").style.display = 'none'; // you can even hide download link if you want
  }
  </script>

<div id="hidden"></div>
<a href="download.php?id=1" onclick="showDownload('You are downloading file id = 1'); return true;" id="link1">Download</a>
</body>
</html>
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