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PHP 上传进度条

发布于 2024-07-19 18:37:17 字数 99 浏览 7 评论 0原文

有谁知道如何在 php 中获取上传进度条？我正在尝试为相册上传器编写代码。我希望在上传照片时显示进度条。

我对 php 相当陌生，所以我不了解它的一切。

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幻想少年梦 2024-07-26 18:37:17

这是迄今为止（经过几个小时的谷歌搜索和尝试脚本）我发现的最简单的设置和最好的上传器

https://github.com/FineUploader/fine-uploader

它不需要 APC 或任何其他外部 PHP 库，我可以在共享主机上获取文件进度反馈，并且它声称支持 html5 拖放（个人未经测试）和多个文件上传。

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请帮我爱他 2024-07-26 18:37:17

如果您安装了APC，它有一个用于上传进度的回调挂钩。

Rasmus Lerdorf（PHP 的创建者）有一个使用 YUI 的示例（哦，这是 PHP 源）。

请参阅此处的文档。

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绾颜 2024-07-26 18:37:17

我很遗憾地说，据我所知，由于 PHP 的工作原理，纯 PHP 上传进度条，甚至 PHP/Javascript 上传进度条都是不可能的。最好的选择是使用某种形式的 Flash 上传器。

AFAIK 这是因为在填充所有超全局变量（包括 $_FILES）之前，您的脚本不会执行。当您的 PHP 脚本被调用时，文件已完全上传。

编辑：这不再是真的。那是在2010年。

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谁与争疯 2024-07-26 18:37:17

一个 PHP-ish (5.2+) & 无 Flash 方式对我来说效果很好：

首先，请参阅 this 帖子解释了如何启动并运行“uploadprogress”扩展。

然后，在包含要从中上传文件的表单的页面中，创建以下 iframe：

<iframe id="progress_iframe" src="" style="display:none;" scrolling="no" frameborder="0"></iframe>

接下来，将此代码添加到“提交”按钮中：

onclick="function set() { f=document.getElementById('progress_iframe'); f.style.display='block'; f.src='uploadprogress.php?id=<?=$upload_id?>';} setTimeout(set);"

现在您的表单中有一个隐藏的 iframe，它将变得可见并显示当您点击“提交”开始上传文件时，uploadprogress.php 的内容。 $upload_id 必须与您在表单中用作隐藏字段“UPLOAD_IDENTIFIER”的值相同。

uploadprogress.php 本身看起来像这样（根据您的需要进行修复和调整）：

<html>
<head>
<META HTTP-EQUIV='REFRESH' CONTENT='1;URL=?id=<?=$_GET['id']?>'>
</head>
<body>
Upload progress:<br />
<?php
    if(!$_GET['id']) die;
    $info = uploadprogress_get_info($_GET['id']);
    $kbytes_total = round($info['bytes_total'] / 1024);
    $kbytes_uploaded = round($info['bytes_uploaded'] / 1024);
    echo $kbytes_uploaded.'/'.$kbytes_total.' KB';
?>
</body>
</html>

请注意，它每秒都会自我刷新。如果您愿意，您当然可以在此处添加一些漂亮的视觉进度条（例如 2 个具有不同颜色的嵌套

）。具有上传进度的 iframe 自然只在上传过程中起作用，并在表单提交且浏览器重新加载到下一页后结束其可见生命。

One PHP-ish (5.2+) & no-Flash way that worked nicely for me:

First, see this post explaining how to get "uploadprogress" extension up and running.

Then, in the page containing the form that you are uploading file(s) from, create the following iframe:

<iframe id="progress_iframe" src="" style="display:none;" scrolling="no" frameborder="0"></iframe>

Next, add this code to your "Submit" button:

onclick="function set() { f=document.getElementById('progress_iframe'); f.style.display='block'; f.src='uploadprogress.php?id=<?=$upload_id?>';} setTimeout(set);"

Now you have a hidden iframe in your form that will come visible and show contents of uploadprogress.php when you click "Submit" to start uploading files. $upload_id must be the same that you are using as the value of hidden field "UPLOAD_IDENTIFIER" in your form.

The uploadprogress.php itself looks about like this (fix and adjust to your needs):

<html>
<head>
<META HTTP-EQUIV='REFRESH' CONTENT='1;URL=?id=<?=$_GET['id']?>'>
</head>
<body>
Upload progress:<br />
<?php
    if(!$_GET['id']) die;
    $info = uploadprogress_get_info($_GET['id']);
    $kbytes_total = round($info['bytes_total'] / 1024);
    $kbytes_uploaded = round($info['bytes_uploaded'] / 1024);
    echo $kbytes_uploaded.'/'.$kbytes_total.' KB';
?>
</body>
</html>

Note that is self-refreshes every second. You can surely add some nice visual progress bar here (like 2 nested <div>s with different colors) if you like. The iframe with upload progress naturally only works while the upload is in progress, and ends its visible life once the form is submitted and browser reloads to the next page.

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仙女 2024-07-26 18:37:17

上传进度条的实现很简单，不需要任何额外的 PHP 扩展、JavaScript 或 Flash。但是您需要 PHP 5.4 及更高版本。

您必须通过设置指令 session.upload_progress.enabled 为 php.ini 中的On。

然后将隐藏输入添加到 HTML 上传表单中，位于任何其他文件输入之前。该隐藏输入的 HTML 属性 name 应该与指令 session.upload_progress.name 来自 php.ini （最终前面是 session.upload_progress.prefix）。 value 属性由您决定，它将用作会话密钥的一部分。

HTML 表单可能如下所示：

<form action="upload.php" method="POST" enctype="multipart/form-data">
   <input type="hidden" name="<?php echo ini_get('session.upload_progress.prefix').ini_get('session.upload_progress.name'); ?>" value="myupload" />
   <input type="file" name="file1" />
   <input type="submit" />
</form>

当您发送此表单时，PHP 应在 $_SESSION 超全局结构中创建一个新键，该键将填充上传状态信息。键是隐藏输入的name 和value 连接而成。

在 PHP 中，您可以查看填充的上传信息：

var_dump($_SESSION[
    ini_get('session.upload_progress.prefix')
   .ini_get('session.upload_progress.name')
   .'_myupload'
]);

输出将类似于以下内容：

$_SESSION["upload_progress_myupload"] = array(
  "start_time" => 1234567890,   // The request time
  "content_length" => 57343257, // POST content length
  "bytes_processed" => 54321,   // Amount of bytes received and processed
  "done" => false,              // true when the POST handler has finished, successfully or not
  "files" => array(
    0 => array(
      "field_name" => "file1",    // Name of the <input /> field
      // The following 3 elements equals those in $_FILES
      "name" => "filename.ext",
      "tmp_name" => "/tmp/phpxxxxxx",
      "error" => 0,
      "done" => false,            // True when the POST handler has finished handling this file
      "start_time" => 1234567890, // When this file has started to be processed
      "bytes_processed" => 54321, // Number of bytes received and processed for this file
    )
  )
);

有创建进度条所需的所有信息 - 您拥有上传是否仍在进行中的信息、有多少字节的信息总共要传输多少字节以及已经传输了多少字节。

要向用户展示上传进度，请编写另一个 PHP 脚本而不是上传脚本，该脚本只会查看会话中的上传信息并以 JSON 格式返回。该脚本可以使用 AJAX 和呈现给用户的信息定期调用，例如每秒调用一次。

您甚至可以通过将 $_SESSION[$key]['cancel_upload'] 设置为 true 来取消上传。

有关详细信息、其他设置和用户评论，请参阅 PHP 手册。

Implementation of the upload progress bar is easy and doesn't require any additional PHP extension, JavaScript or Flash. But you need PHP 5.4 and newer.

You have to enable collecting of the upload progress information by setting the directive session.upload_progress.enabled to On in php.ini.

Then add a hidden input to the HTML upload form just before any other file inputs. HTML attribute name of that hidden input should be the same as the value of the directive session.upload_progress.name from php.ini (eventually preceded by session.upload_progress.prefix). The value attribute is up to you, it will be used as part of the session key.

HTML form could looks like this:

<form action="upload.php" method="POST" enctype="multipart/form-data">
   <input type="hidden" name="<?php echo ini_get('session.upload_progress.prefix').ini_get('session.upload_progress.name'); ?>" value="myupload" />
   <input type="file" name="file1" />
   <input type="submit" />
</form>

When you send this form, PHP should create a new key in the $_SESSION superglobal structure which will be populated with the upload status information. The key is concatenated name and value of the hidden input.

In PHP you can take a look at populated upload information:

var_dump($_SESSION[
    ini_get('session.upload_progress.prefix')
   .ini_get('session.upload_progress.name')
   .'_myupload'
]);

The output will look similarly to the following:

$_SESSION["upload_progress_myupload"] = array(
  "start_time" => 1234567890,   // The request time
  "content_length" => 57343257, // POST content length
  "bytes_processed" => 54321,   // Amount of bytes received and processed
  "done" => false,              // true when the POST handler has finished, successfully or not
  "files" => array(
    0 => array(
      "field_name" => "file1",    // Name of the <input /> field
      // The following 3 elements equals those in $_FILES
      "name" => "filename.ext",
      "tmp_name" => "/tmp/phpxxxxxx",
      "error" => 0,
      "done" => false,            // True when the POST handler has finished handling this file
      "start_time" => 1234567890, // When this file has started to be processed
      "bytes_processed" => 54321, // Number of bytes received and processed for this file
    )
  )
);

There is all the information needed to create a progress bar — you have the information if the upload is still in progress, the information how many bytes is going to be transferred in total and how many bytes has been transferred already.

To present the upload progress to the user, write an another PHP script than the uploading one, which will only look at the upload information in the session and return it in the JSON format, for example. This script can be called periodically, for example every second, using AJAX and information presented to the user.

You are even able to cancel the upload by setting the $_SESSION[$key]['cancel_upload'] to true.

For detailed information, additional settings and user's comments see PHP manual.

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