[PHP知识库]文件上传进度

最近在阅读PHP文档，看到session模块时，发现可以通过seession获取文件上传进度，于是动手实践了以下。

文档地址如下，文档还是要仔细看，我就不搬了：https://www.php.net/manual/zh/session.upload-progress.php

下面是我的demo,环境配置

配置文件php.ini

session.upload_progress.enabled = On
session.upload_progress.cleanup = On
session.upload_progress.prefix = "upload_progress_"
session.upload_progress.name = "PHP_SESSION_UPLOAD_PROGRESS"
session.upload_progress.freq =  "1%"
session.upload_progress.min_freq = "1"

配置文件nginx.conf

fastcgi_request_buffering off;#这个很重要

环境说明：

	1、php8.1
	2、nginx 1.17.10

表单文件 index.php，form的target属性主要是控制上传完成后是否跳转页面，这里不跳转所有设定为内嵌的iframe的id

<form action="upload.php" method="POST" enctype="multipart/form-data" target="hidden_iframe">
 <input type="hidden" name="<?php echo ini_get("session.upload_progress.name"); ?>" value="test" />
 <input type="file" name="file1" />
 <input type="file" name="file2" />
 <input type="submit" value="upload"/>
</form>
<iframe id="hidden_iframe" name="hidden_iframe" src="about:blank" style="display:none;"></iframe>
<div>进度：<span id="progress"></span></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script>
function getProgress(){
    $.get('progress.php',{<?php echo ini_get("session.upload_progress.name"); ?>:"test"},function(res){
                $('#progress').text(res);
                if(res != 100)
                    setTimeout('getProgress()',100);
            })
}
$('form').submit(function(){
    setTimeout('getProgress()',100);
});
</script>

文件上传处理 upload.php

写的别叫简单

<?php
//var_dump($_FILES);
foreach ($_FILES as $file){
    move_uploaded_file($file['tmp_name'], 'files/'.time());
}

进度获取 progress.php

<?php
/**
 * AJAX获取上传文件进度
 */
session_start();
$i = ini_get('session.upload_progress.name');
//session.upload_progress.name = "PHP_SESSION_UPLOAD_PROGRESS"
$key = ini_get("session.upload_progress.prefix") . $_GET[$i];
//session.upload_progress.prefix = "upload_progress_" . 'test'
if (!empty($_SESSION[$key])) {
    $current = $_SESSION[$key]["bytes_processed"]; // 已收到的数据长度
    $total   = $_SESSION[$key]["content_length"];  // POST请求的总数据长度
    echo $current < $total ? ceil($current / $total * 100) : 100;
}else{
    echo 100;
}