Analysis of the principle of APC method for uploading multiple files in PHP

We may often need a long waiting time when uploading multiple files, and due to the influence of network and software, timeouts and upload failures often occur. How to get the file upload progress in real time when uploading multiple files in PHP, and how to avoid the limitations of PHP and other factors to upload files of any size?

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PHP processes uploaded files differently from other languages such as ASP. In ASP, you can use Request.BinaryRead to read the data submitted by the client in a streaming manner. PHP stores the file in a temporary folder, and can obtain its information and operate on it only after the file is uploaded. If we can get the file name of its temporary file during the upload process, we can get the upload progress by judging the size of the temporary file, but there seems to be no way to get it. So we can only use other methods, which is to use PHP's socket extension to build a simple server, post the data to this server, and then use our own mechanism to process it.

Let’s talk about the process first. First, use PHP’s socket function library to establish a temporary http server, listen on a certain port, and then notify the client of the IP address and port number. The client submits the upload form (temporary server). The temporary server accepts the client request, reads the post data, analyzes and obtains the file information uploaded by the client, saves the file on the server, then closes the temporary server, releases the resources, and the upload is completed. It’s a bit convoluted, but the idea is still simple.

I will release a class library later, tentatively named: UGiA Visual PHP Uploader, so that everyone can easily call it in the program. The effect of uploading multiple files with PHP is as follows:

APC implementation method for uploading multiple files in PHP :

Install APC, refer to the official documentation for installation, you can use the PECL module installation method to quickly and easily configure php.ini, which is not explained here. Set the parameter apc.rfc1867=1 to enable APC to support the upload progress bar function, which is in the APC source code documentation. Code examples with instructions:

<ol class="dp-xml">
<li class="alt"><span><span>if ($_SERVER['REQUEST_METHOD'] == 'POST') {  //上传请求  </span></span></li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">status</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">apc_fetch</font></span><span>('upload_' . $_POST['APC_UPLOAD_PROGRESS']);  </span>
</li>
<li class="alt"><span>$status['done'] = 1;  </span></li>
<li class=""><span>echo json_encode($status);  //输出给用户端页面里的ajax调用，相关文档请自己寻找  </span></li>
<li class="alt"><span>exit;  </span></li>
<li class=""><span>} elseif (isset($_GET['progress_key'])) {   //读取上传进度  </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">status</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">apc_fetch</font></span><span>('upload_'.$_GET['progress_key']);  </span>
</li>
<li class=""><span>echo json_encode($status);  </span></li>
<li class="alt"><span>exit;  </span></li>
<li class=""><span>} else {  </span></li>
<li class="alt"><span>//其他代码，比如上传表单等  </span></li>
<li class=""><span>} </span></li>
</ol>

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uploadprogress module implementation method:

<ol class="dp-xml">
<li class="alt"><span><span>使用PECL模块安装方法安装该模块php.ini里面设置 </span><span class="attribute"><font color="#ff0000">uploadprogress.file.filename_template</font></span><span> = “/tmp/upd_%s.txt”代码范例：  </span></span></li>
<li class=""><span>if($_SERVER['REQUEST_METHOD']=='POST') {  </span></li>
<li class="alt"><span>if (is_uploaded_file($_FILES['upfile']['tmp_name'])) {  </span></li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">upload_dir</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">'your_path/'</font></span><span>;  </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">ext</font></span><span>        = </span><span class="attribute-value"><font color="#0000ff">strrchr</font></span><span>($_FILES['video']['name'], '.');  </span>
</li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">sessid</font></span><span>     = $_POST['UPLOAD_IDENTIFIER'] ;  </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">tmpfile</font></span><span>    = $upload_dir . $sessid;  </span>
</li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">sessfile</font></span><span>   = $upload_dir . $sessid .$ext;  </span>
</li>
<li class="alt"><span>if (move_uploaded_file($_FILES['upfile']['tmp_name'],$tmpfile)) {  </span></li>
<li class=""><span>//上传成功  </span></li>
<li class="alt"><span>} else {  </span></li>
<li class=""><span>//上传失败  </span></li>
<li class="alt"><span>} else {  </span></li>
<li class=""><span>//上传错误  </span></li>
<li class="alt"><span> </span></li>
<li class=""><span>} elseif (!empty($_GET['sessid'])) {  </span></li>
<li class="alt"><span>header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");  </span></li>
<li class=""><span>header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");  </span></li>
<li class="alt"><span>header("Cache-Control: no-store, no-cache, must-revalidate");  </span></li>
<li class="">
<span>header("Cache-Control: </span><span class="attribute"><font color="#ff0000">post-check</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">0</font></span><span>, </span><span class="attribute"><font color="#ff0000">pre-check</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">0</font></span><span>", false);  </span>
</li>
<li class="alt"><span>header("Pragma: no-cache");  </span></li>
<li class="">
<span>header("Content-Type:text/html;</span><span class="attribute"><font color="#ff0000">charset</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">UTF</font></span><span>-8");  </span>
</li>
<li class="alt"><span> </span></li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">unique_id</font></span><span> = $_GET['sessid'];  </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">uploadvalues</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">uploadprogress_get_info</font></span><span>($unique_id);  </span>
</li>
<li class=""><span> </span></li>
<li class="alt"><span>if (is_array($uploadvalues)) {  </span></li>
<li class=""><span>echo json_encode($uploadvalues);  </span></li>
<li class="alt"><span>} else {  </span></li>
<li class=""><span>//读取进度失败，另外处理逻辑  </span></li>
<li class="alt"><span>}  </span></li>
<li class=""><span> </span></li>
<li class="alt"><span>} else {  </span></li>
<li class=""><span>//显示上传表单  </span></li>
</ol>

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Analysis of the principle of APC method for uploading multiple files in PHP_PHP tutorial