我们在编写文件上传代码的时候，还需要考虑一个重要的实现功能，那就是文件上传所需要的进度条。目前我知道我这里举两个分别实现的例子供参考，更灵活的应用根据自己需要来修改。
APC的PHP文件上传进度条实现方法：
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($status); </span></li>
<li class="alt"><span> exit; </span></li>
<li class=""><span>} else { </span></li>
<li class="alt"><span> //其他代码，比如上传表单等 </span></li>
<li class=""><span>} </span></li>
</ol>uploadprogress 模块实现方法：
使用PECL模块安装方法安装该模块的PHP文件上传进度条实现方法
php.ini里面设置 uploadprogress.file.filename_template = “/tmp/upd_%s.txt”
代码范例：
<ol class="dp-xml">
<li class="alt"><span><span>if($_SERVER['REQUEST_METHOD']=='POST') { </span></span></li>
<li class=""><span> if (is_uploaded_file($_FILES['upfile']['tmp_name'])) { </span></li>
<li class="alt">
<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="">
<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="alt">
<span> $</span><span class="attribute"><font color="#ff0000">sessid</font></span><span> = $_POST['UPLOAD_IDENTIFIER'] ; </span>
</li>
<li class="">
<span> $</span><span class="attribute"><font color="#ff0000">tmpfile</font></span><span> = $upload_dir . $sessid; </span>
</li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">sessfile</font></span><span> = $upload_dir . $sessid .$ext; </span>
</li>
<li class=""><span> if (move_uploaded_file($_FILES['upfile']['tmp_name'],$tmpfile)) { </span></li>
<li class="alt"><span> //上传成功 </span></li>
<li class=""><span> } else { </span></li>
<li class="alt"><span> //上传失败 </span></li>
<li class=""><span> } else { </span></li>
<li class="alt"><span> //上传错误 </span></li>
<li class=""><span> </span></li>
<li class="alt"><span>} elseif (!empty($_GET['sessid'])) { </span></li>
<li class=""><span> header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); </span></li>
<li class="alt"><span> header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); </span></li>
<li class=""><span> header("Cache-Control: no-store, no-cache, must-revalidate"); </span></li>
<li class="alt">
<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=""><span> header("Pragma: no-cache"); </span></li>
<li class="alt">
<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=""><span> </span></li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">unique_id</font></span><span> = $_GET['sessid']; </span>
</li>
<li class="">
<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="alt"><span> </span></li>
<li class=""><span> if (is_array($uploadvalues)) { </span></li>
<li class="alt"><span> echo json_encode($uploadvalues); </span></li>
<li class=""><span> } else { </span></li>
<li class="alt"><span> //读取进度失败，另外处理逻辑 </span></li>
<li class=""><span> } </span></li>
<li class="alt"><span> </span></li>
<li class=""><span>} else { </span></li>
<li class="alt"><span> //显示上传表单 </span></li>
<li class=""><span>} </span></li>
</ol>以上就是我们为大家介绍的两种PHP文件上传进度条的具体方法。
