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# CXXI. Rar Functions

# 简介

Rar is a powerful and effective archiver created by Eugene Roshal. This extension gives you possibility to read Rar archives but doesn't support writing Rar archives, because this is not supported by UnRar library and is directly prohibited by it's license.

More information about Rar and UnRar can be found at http://www.rarlabs.com/.

# 需求

要编译本扩展模块不需要外部库文件。

# 运行时配置

本扩展模块在 `php.ini` 中未定义任何配置选项。

# 安装

Rar is currently available through PECL http://pecl.php.net/package/rar.

Also you can use the pear installer to install the Rar extension, using the following command: pear -v install rar.

You can always download the tar.gz package and install Rar by hand:

例子 1. Rar installation

    gunzip rar-xxx.tgz
    tar -xvf rar-xxx.tar
    cd rar-xxx
    phpize
    ./configure && make && make install

Windows users can download the extension dll `php_rar.dll` here: http://snaps.php.net/win32/PECL_STABLE/.

# 资源类型

There is one resource used in Rar extension: a file descriptor returned by rar_open().

# 预定义常量

`RAR_HOST_MSDOS` (integer)

`RAR_HOST_OS2` (integer)

`RAR_HOST_WIN32` (integer)

`RAR_HOST_UNIX` (integer)

`RAR_HOST_BEOS` (integer)

# 范例

例子 2. Rar extension overview example

`<?php $rar_file = rar_open('example.rar') or die("Can't open Rar archive"); $entries = rar_list($rar_file); foreach ($entries as $entry) { echo 'Filename: ' . $entry->getName() . "\n"; echo 'Packed size: ' . $entry->getPackedSize() . "\n"; echo 'Unpacked size: ' . $entry->getUnpackedSize() . "\n"; $entry->extract('/dir/extract/to/'); } rar_close($rar_file); ?>`

This example opens a Rar file archive and extracts each entry to the specified directory.

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