How to create compressed RAR file in PHP?
如何在PHP中创建压缩的RAR文件？
在网站中，上传文件大多数都是以压缩包形式存在的，所以我们首先必须要将上传的文件压缩后才能够上传，那么我们如何实现网站中上传文件的自动压缩功能呢？今天就给大家详细介绍一下！
文件压缩主要应用PHP 的预定义类 com，将wscrip.shell 对象作为 com类的参数，最终通过调用 com类的 run()方法实现文件的压缩。
com 类提供了一个将 COM组件整合到 PHP 脚本中的框架，实例化方法如下：
$obj = new COM("server.object")com类构造函数的语法如下：
string COM::COM( string module_name [, string server_name [, int codepage]] )
参数说明：
module_name：被请求组件的名字 或者 class-id。
server_name ：DCOM 服务器的名字，组件在此服务器上被取用，如果是NULL，那么假定是loaclhost。如果要支持允许DCOM，那么必须将 php.ini 中的 com.allow_dcom设置为 TRUE。
codepage：指定用于将PHP 字符串（php-string）转换成UNICODE 字符串（unicode-strings）的代码页，反之亦然。可用的值有CP_ACP , CP_MACCP , CO_OEMCP , CP_SYMBOL , CP_THREAD_ACP, CP_UTF7以及CP_UTF8。
com类中的 run()方法的语法格式如下：
run("winrar a 生成的 rar 文件的路径及名称 要压缩的文件的路径以及名称",1,false);应用实例
本实例中讲解在PHP中如何创建 RAR文件，具体步骤如下：
（1）创建PHP页面，首先创建一个表单，设置文件域，提交要压缩的文件，设置文本框，提交压缩文件的存储位置，设置按钮，完成表单元素的提交操作。
（2） 在php文件中编写 PHP脚本，通过post方法获取表单提交的数据，通过iconv()函数完成数据编码格式的转换，实例化 com类，调用 run()方法完成文件的压缩操作。
其代码如下：
<?php
header("Content-Type:text/html; charset=utf-8");
if ($_POST['Submit']){
$sourcefile = iconv("utf-8","gb2312",$_POST['sourcefile']); //获取指定文件的路径
$objfile = $_POST['objfile']."\\".time(); //定义压缩文件的存储位置和名称
$objfile = iconv("utf-8","gb2312",$objfile); //实现编码转换
$obj= new COM("wscript.shell"); //实例化 com类
$obj -> run("winrar a".$objfile."".$sourcefile."",1,false); //调用类中的方法
echo "<script>alert('文件压缩完成！');</script>";
}
?>运行本实例，首先选择要压缩的文件，然后设置压缩文件的存储位置，单击“提交”按钮，就完成了！
注意：
在执行文件压缩操作时，切记在文件的存储路径中不要出现空格（包括被压缩文件的路径、名称一级压缩文件的存储路径），否则压缩操作将不会正确执行！
到这里我们就介绍完如何在PHP中创建压缩的RAR文件了，小伙伴们都掌握了吗？
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