PHP在不离开当前页面的情况下制作下载计数器

我试图用PHP创建一个下载计数器。我创建的脚本是有效的，但当我单击下载链接时，脚本会将我发送到一个空白页面。在下载和计数时是否可以停留在页面上？

这是我下载的php文件的代码：

<?php
$Down=$_GET['Down'];
?>
<html>
<head>
<meta http-equiv="refresh" content="0;url=<?php echo $Down; ?>">
</head>
<body>
<?php
$fp = fopen("counter.txt", "r");
$count = fread($fp, 1024);
fclose($fp);
$count = $count + 1;
$fp = fopen("counter.txt", "w");
fwrite($fp, $count);
fclose($fp);

?>
</body>
</html>

这就是我的index.php中的链接的样子：

<a href="download.php?Down=download.zip">download</a>

非常感谢！

好吧，因为这里缺少大部分代码，这是一个例子，基本上你需要调用download.php文件中的计数器代码，并在完成计数器代码和设置下载头之后传递文件内容。还要小心，或者只需将文件名传递给下载功能，就可以允许恶意人员从您的服务器下载任何文件。download.php?file=index.php等

<?php 
function get_download_count($file=null){
    $counters = './counters/';
    if($file == null) return 0;
    $count = 0;
    if(file_exists($counters.md5($file).'_counter.txt')){
        $fp = fopen($counters.md5($file).'_counter.txt', "r");
        $count = fread($fp, 1024);
        fclose($fp);
    }else{
        $fp = fopen($counters.md5($file).'_counter.txt', "w+");
        fwrite($fp, $count);
        fclose($fp);
    }
    return $count;
}
?>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title></title>
</head>
<body>
<a href="./download.php?file=exampleA.zip">exampleA.zip</a> (Downloaded <?php echo get_download_count('exampleA.zip');?> times)<br>
<a href="./download.php?file=exampleB.zip">exampleB.zip</a> (Downloaded <?php echo get_download_count('exampleB.zip');?> times)<br>
</body>
</html>

download.php正如您所看到的，它不会输出HTML，因为这会损坏文件。

<?php 
//where the files are
$downloads_folder = './files/';
$counters_folder = './counters/';
//has a file name been passed?
if(!empty($_GET['file'])){
    //protect from people getting other files
    $file = basename($_GET['file']);
    //does the file exist?
    if(file_exists($downloads_folder.$file)){
        //update counter - add if dont exist
        if(file_exists($counters_folder.md5($file).'_counter.txt')){
            $fp = fopen($counters_folder.md5($file).'_counter.txt', "r");
            $count = fread($fp, 1024);
            fclose($fp);
            $fp = fopen($counters_folder.md5($file).'_counter.txt', "w");
            fwrite($fp, $count + 1);
            fclose($fp);
        }else{
            $fp = fopen($counters_folder.md5($file).'_counter.txt', "w+");
            fwrite($fp, 1);
            fclose($fp);
        }
        //set force download headers
        header('Content-Description: File Transfer');
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename="'.$file.'"');
        header('Content-Transfer-Encoding: binary');
        header('Connection: Keep-Alive');
        header('Expires: 0');
        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
        header('Pragma: public');
        header('Content-Length: ' . sprintf("%u", filesize($downloads_folder.$file)));
        //open and output file contents
        $fh = fopen($downloads_folder.$file, "rb");
        while (!feof($fh)) {
            echo fgets($fh);
            flush();
        }
        fclose($fh);
        exit;
    }else{
        header("HTTP/1.0 404 Not Found");
        exit('File not found!');
    }
}else{
    exit(header("Location: ./index.php"));
}
?>

请确保检查$downloads_folder变量是否正确。希望能有所帮助。

下载完整的示例代码

尝试使用php头重定向而不是JS或元标记重定向：

<?php
//counter code
$fp = fopen("counter.txt", "r");
$count = fread($fp, 1024);
fclose($fp);
$count = $count + 1;
$fp = fopen("counter.txt", "w");
fwrite($fp, $count);
fclose($fp);
// redirect
header("location: ".$_GET["Down"]);
exit;

还要确保在标头之前没有任何输出。

http://www.php.net/manual/en/function.header.php

同样对于链接，如果它仍然不起作用，请尝试添加目标属性：

<a href="download.php?Down=download.zip" target="_new">download</a>

我想改进Lawrence Cherone的答案。下载计数器imho应该是透明的，所以它更安全，没有人可以直接访问php脚本。最后，我集成了jquery，以便通过ajax实时更新计数器。。。所以不需要重新加载页面来查看结果。。。

.htaccess（位于root/files/中）

RewriteEngine on
RewriteRule ^(.*).(rar|zip)$ /php/doing_download.php?file=$1.$2 [R,L]

doing_download.php（位于root.php中）

<?php
  $downloads_folder = $_SERVER['DOCUMENT_ROOT'] . '/files/';
  $counters_folder = $_SERVER['DOCUMENT_ROOT'] . '/files/counter/';
  if (!empty($_GET['file'])) {
    $file = basename($_GET['file']);
    $type = array("zip", "rar");
    $exts = strtolower(substr(strrchr($file, "."), 1));
    if (!in_array($exts, $type)) {
      header("HTTP/1.0 403 Forbidden");
      exit('File not allowed!');
    } else {
      if (file_exists($downloads_folder . $file)) {
        if (file_exists($counters_folder . md5($file) . '_counter.txt')) {
          $fp = fopen($counters_folder . md5($file) . '_counter.txt', "r");
          $count = fread($fp, 1024);
          fclose($fp);
          $fp = fopen($counters_folder . md5($file) . '_counter.txt', "w");
          fwrite($fp, $count + 1);
          fclose($fp);
        } else {
          $fp = fopen($counters_folder . md5($file) . '_counter.txt', "w+");
          fwrite($fp, 1);
          fclose($fp);
        }
        header('Content-Description: File Transfer');
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename="' . $file . '"');
        header('Content-Transfer-Encoding: binary');
        header('Connection: Keep-Alive');
        header('Expires: 0');
        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
        header('Pragma: public');
        header('Content-Length: ' . sprintf("%u", filesize($downloads_folder . $file)));
        $fh = fopen($downloads_folder . $file, "rb");
        while (!feof($fh)) {
          echo fgets($fh);
          flush();
        }
        fclose($fh);
        exit;
      } else {
        header("HTTP/1.0 404 Not Found");
        exit('File not found!');
      }
    }
  }
?>

count_download.php（位于root/php/）

<?php
  function get_download_count($file = null) {
    $counters = $_SERVER['DOCUMENT_ROOT'] . '/files/counter/';
    if ($file == null) return 0;
    $count = 0;
    if (file_exists($counters . md5($file) . '_counter.txt')) {
      $fp = fopen($counters . md5($file) . '_counter.txt', "r");
      $count = fread($fp, 1024);
      fclose($fp);
    } else {
      $fp = fopen($counters . md5($file) . '_counter.txt', "w+");
      fwrite($fp, $count);
      fclose($fp);
    }
    return $count;
  }
?>

call_download.php（位于root.php中）

<?php
  include($_SERVER["DOCUMENT_ROOT"] . "/php/count_download.php");
  $item['item1'] = get_download_count('exampleA.zip');
  $item['item2'] = get_download_count('exampleB.zip');
  echo json_encode($item);
?>

static_download.php（位于root.php中）

<?php
  include($_SERVER["DOCUMENT_ROOT"] . "/php/count_download.php");
  $item['item1'] = get_download_count('exampleA.zip');
  $item['item2'] = get_download_count('exampleB.zip');
?>

download.js（位于root/jsc/）

$(document).ready(function() {
  $.ajaxSetup({cache: false});
  getStatus();
});
function getStatus() {
  $.getJSON('php/call_download.php', function(data) {
    $('#item1').html(data.item1);
    $('#item2').html(data.item2);
  });
  setTimeout("getStatus()",1000);
}

index.php（位于root/）

<?php include($_SERVER["DOCUMENT_ROOT"] . "/php/static_download.php"); ?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Download Page</title>
<script type="text/javascript" src="jsc/jquery.min.js"></script>
<script type="text/javascript" src="jsc/download.js"></script>
</head>
<body>
File: <a href="files/exampleA.zip">exampleA.zip</a>&nbsp; - &nbsp;Downloaded <span id="item1"><?php echo $item['item1']; ?></span> Times<br />
File: <a href="files/exampleB.zip">exampleB.zip</a>&nbsp; - &nbsp;Downloaded <span id="item2"><?php echo $item['item2']; ?></span> Times<br />
File: <a href="test/test.zip">test.zip</a><!-- this file never will be counted since is located in other folder --><br />
</body>
</html>

在这里，您可以下载所有文件并进行测试

我希望我基于劳伦斯·切隆的回答能解决任何问题：）@Lawrence Cherone：干得好！！！

<?php
function downloadCount(){
    $counter = file_get_contents('counter.txt','r');
    $counter = $counter+ 1;
    $myfile = fopen("counter.txt", "w");
    fwrite($myfile, $counter);
    fclose($myfile);
                    
    return $counter;
}
?>
</header>
<body>
HTML...
<a href="download.php?Down=True">
DOWNLOAD </a> <br> DOWNLOADED
<?php 
if ($_GET['Down'])
{
    $counter = downloadCount();
    header("location: YourDownloadLink.fileExtension ");
}
$counter = file_get_contents('counter.txt','r');
                    
echo $counter
                    
?>
 TIMES</h2>

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