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APC方法实现PHP上传多个文件原理剖析

Jun 13, 2016 am 10:19 AM
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我们在上传多个文件的时候可能往往需要很长的等待时间,而且受网络和软件等的影响,经常会出现超时及上传失败的现象。如何在PHP上传多个文件时实时的得到文件上传进度,以及如何避开php和其他因素的限制上传任意大小的文件呢?

  • 经验总结:示例PHP上传文件代码
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  • 挖掘PHP上传文件类型原理实现
  • 三步FTP实现PHP上传文件代码剖析
  • 两种PHP上传文件大小限制解决方案
php同asp等其他语言对上传文件的处理方式不同,asp中可以用Request.BinaryRead流式的读取客户端提交的数据。php是把文件存放在临时文件夹中,在文件上传完成后才能够获取其信息以及对其进行操作。如果在上传过程中我们能够得到其临时文件的文件名,我们就可以通过判断临时文件的大小来来得到上传进度,不过好像没有办法得到。所以我们只能通过其他方式,就是利用php的socket扩展建立一个简单的服务器,把数据post到这个服务器上,然后再用我们自己的机制来处理。

先说说流程,首先用php的socket函数库建立一个临时的http服务器,在某一端口监听,然后把 ip地址和端口号通知客户端,客户端把上传表单提交(临时服务器), 临时服务器接受客户端请求,并读取post数据,分析并获取客户端上传的文件信息,把文件保存在服务器上,然后关闭临时服务器,释放资源,上传完成。有点绕,不过思路还是简单的。

稍后我会发布一个类库,暂定名为:UGiA Visual PHP Uploader, 这样大家就可以在程序中很方便的调用了。PHP上传多个文件效果如下:

PHP上传多个文件之APC实现方法

安装APC,参照官方文档安装,可以使用PECL模块安装方法快速简捷,这里不说明配置php.ini,设置参数 apc.rfc1867=1 ,使APC支持上传进度条功能,在APC源码说明文档里面有说明代码范例:

<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 模块实现方法

<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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