PHP Ajax 上传进度条

2022-01-09 00:00:00 progress-bar upload php javascript ajax 
<form enctype="multipart/form-data" action="upload.php" method="POST">
<input name="uploaded" type="file" />
<input type="submit" value="Upload" />
</form>

<?php
if(isset($_REQUEST['submit'])){
   $target = "data/".basename( $_FILES['uploaded']['name']) ;
   move_uploaded_file($_FILES['uploaded']['tmp_name'], $target);
}
?>

我非常了解 Javascript、AJAX 和 JQuery 等，我相信可以使用 PHP、AJAX 和 Javascript 等创建上传进度条.

I know Javascript, AJAX and JQuery etc very well and I believe an upload progress bar can be created using PHP, AJAX and Javascript etc.

我很惊讶如何在正在上传.

这是 PHP 手册的链接，但我不明白:http://php.net/manual/en/session.upload-progress.php

Here is link to the PHP manual but I didn't understand that: http://php.net/manual/en/session.upload-progress.php

有没有其他方法可以使用 PHP 和 AJAX 显示上传进度条，但不使用 PHP 的任何外部扩展?我无权访问 php.ini

Is there any other method to show the upload progress bar using PHP and AJAX but without use of any external extension of PHP? I don't have access to php.ini

推荐答案

简介

PHP Doc 说得很详细

Introduction

The PHP Doc is very detailed it says

当上传正在进行时，上传进度将在 $_SESSION 超全局中可用，并且当 POST 与 session.upload_progress.name INI 设置设置为同名的变量时.当 PHP 检测到此类 POST 请求时，它将在 $_SESSION 中填充一个数组，其中索引是 session.upload_progress.prefix 和 session.upload_progress.name INI 选项的连接值.通常通过读取这些 INI 设置来检索密钥，即

The upload progress will be available in the $_SESSION superglobal when an upload is in progress, and when POSTing a variable of the same name as the session.upload_progress.name INI setting is set to. When PHP detects such POST requests, it will populate an array in the $_SESSION, where the index is a concatenated value of the session.upload_progress.prefix and session.upload_progress.name INI options. The key is typically retrieved by reading these INI settings, i.e.

您需要的所有信息都已在 PHP 会话命名中准备就绪

All the information you require is all ready in the PHP session naming

  • 开始时间
  • 内容长度
  • bytes_processed
  • 文件信息(支持多个)

您只需提取此信息并将其显示在您的 HTML 表单中.

All you need is to extract this information and display it in your HTML form.

<link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css"
rel="stylesheet" type="text/css" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script>
<script type="text/javascript">
    var intval = null;
    var percentage = 0 ;
    function startMonitor() {
        $.getJSON('b.php',
        function (data) {
            if (data) {
                percentage = Math.round((data.bytes_processed / data.content_length) * 100);
                $("#progressbar").progressbar({value: percentage});
                $('#progress-txt').html('Uploading ' + percentage + '%');

            }
            if(!data || percentage == 100){
                $('#progress-txt').html('Complete');
                stopInterval();
            }
        });
    }

    function startInterval() {
        if (intval == null) {
            intval = window.setInterval(function () {startMonitor()}, 200)
        } else {
            stopInterval()
        }
    }

    function stopInterval() {
        if (intval != null) {
            window.clearInterval(intval)
            intval = null;
            $("#progressbar").hide();
            $('#progress-txt').html('Complete');
        }
    }

    startInterval();
</script>

b.php

session_start();
header('Content-type: application/json');
echo json_encode($_SESSION["upload_progress_upload"]);

PHP 会话上传进度示例

这里是 PHP 会话上传的一个更好的优化版本进展

$('#fileupload').bind('fileuploadsend', function (e, data) {
    // This feature is only useful for browsers which rely on the iframe transport:
    if (data.dataType.substr(0, 6) === 'iframe') {
        // Set PHP's session.upload_progress.name value:
        var progressObj = {
            name: 'PHP_SESSION_UPLOAD_PROGRESS',
            value: (new Date()).getTime()  // pseudo unique ID
        };
        data.formData.push(progressObj);
        // Start the progress polling:
        data.context.data('interval', setInterval(function () {
            $.get('progress.php', $.param([progressObj]), function (result) {
                // Trigger a fileupload progress event,
                // using the result as progress data:
                e = document.createEvent('Event');
                e.initEvent('progress', false, true);
                $.extend(e, result);
                $('#fileupload').data('fileupload')._onProgress(e, data);
            }, 'json');
        }, 1000)); // poll every second
    }
}).bind('fileuploadalways', function (e, data) {
    clearInterval(data.context.data('interval'));
});

progress.php

$s = $_SESSION['upload_progress_'.intval($_GET['PHP_SESSION_UPLOAD_PROGRESS'])];
$progress = array(
        'lengthComputable' => true,
        'loaded' => $s['bytes_processed'],
        'total' => $s['content_length']
);
echo json_encode($progress);

其他例子

  • 使用 PHP 和 JavaScript 跟踪上传进度
  • PHP-5.4-Upload-Progress-Example

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