安装环境
在安装PEAR之前需要配置安装PHP环境，如果没有自带PEAR
(直接访问http://go-pear.org并保存其首页为go-pear.php)
PEAR安装准备
如果PHP运行环境没有自带PEAR，则需要下载go-pear.php文件，同时保存在php.exe所在的目录下。
PEAR安装步骤
1、我这里用的是wamp集成环境，d:\wamp\bin\php\php5.2.5>go-pear，开始自动安装。 
通过这个PEAR安装截图，可以看到首先需要确认PEAR的安装目录结构，系统通常能自动识别。
2、确认好PEAR在Windows下的安装目录结构，回车，开始下载和安装PEAR的默认扩展包，你也可以选择是否同时安装Pear_Frontend_Web-beta，Pear_Frontend_Gtk2，MDB2扩展包。
3、PEAR默认扩展包安装后，提示是否需要配置php.ini文件中的include_path选项指向pear的安装目录，当然需要配置，否则无法使用，Y并回车，安装包会自动修改include_path选项。
PEAR安装完成，双击PEAR_ENV.reg将相关信息导入注册表，同时重启Apache即可。
PEAR的其他安装方法
如果PHP运行环境自带PEAR，则可以在PHP目录下找到PEAR.DAT文件，双击这个文件即可进行PEAR安装，方式应该类似上述安装方式。同时注意修改PHP.INI中的include_path选项即可。
PEAR命令
在命令行方式下，运用PEAR的相关命令可以安装自己需要的PEAR安装包。
pear help 列出pear的所有命令，类似于pear的命令帮助命令。
pear help <command> 列出某个pear命令的具体信息
pear help shortcuts 列出所有pear命令的简写
pear list-all 列出所有可安装的packages，很多，可以访问pear扩展包列表找到需要的packages，再使用pear install命令安装package。
(安装pear时，可以让其使用默认值，一直回车完。)
接着安装单元测试框架phpunit:
d:\wamp\bin\php\php5.2.5>pear channel-discover pear.phpunit.de
Adding Channel "pear.phpunit.de" succeeded
Discovery of channel "pear.phpunit.de" succeeded
d:\wamp\bin\php\php5.2.5>pear install phpunit/PHPUnit
Did not download optional dependencies: pear/Image_GraphViz, pear/Log, channel:/
/pear.symfony-project.com/YAML, use --alldeps to download automatically
phpunit/PHPUnit requires PEAR Installer (version >= 1.8.1), installed version is
1.6.1
phpunit/PHPUnit can optionally use package "pear/Image_GraphViz" (version >= 1.2
.1)
phpunit/PHPUnit can optionally use package "pear/Log"
phpunit/PHPUnit can optionally use package "channel://pear.symfony-project.com/Y
AML" (version >= 1.0.2)
phpunit/PHPUnit can optionally use PHP extension "pdo_sqlite"
phpunit/PHPUnit can optionally use PHP extension "soap"
phpunit/PHPUnit can optionally use PHP extension "xdebug" (version >= 2.0.5)
No valid packages found
install failed
(安装phpunit失败，此时通过pear upgrade pear更新pear后继续安装)
d:\wamp\bin\php\php5.2.5>pear upgrade pear
downloading PEAR-1.9.0.tgz ...
Starting to download PEAR-1.9.0.tgz (291,634 bytes)
......
d:\wamp\bin\php\php5.2.5>pear info pear
ABOUT PEAR.PHP.NET/PEAR-1.9.0
......
d:\wamp\bin\php\php5.2.5>pear channel-discover pear.phpunit.de
Channel "pear.phpunit.de" is already initialized
d:\wamp\bin\php\php5.2.5>pear install phpunit/PHPUnit
Unknown remote channel: pear.symfony-project.com
Did not download optional dependencies: pear/Image_GraphViz, pear/Log, channel:/
/pear.symfony-project.com/YAML, use --alldeps to download automatically
phpunit/PHPUnit can optionally use package "pear/Image_GraphViz" (version >= 1.2
.1)
phpunit/PHPUnit can optionally use package "pear/Log"
phpunit/PHPUnit can optionally use package "channel://pear.symfony-project.com/Y
AML" (version >= 1.0.2)
phpunit/PHPUnit can optionally use PHP extension "pdo_sqlite"
phpunit/PHPUnit can optionally use PHP extension "soap"
phpunit/PHPUnit can optionally use PHP extension "xdebug" (version >= 2.0.5)
downloading PHPUnit-3.4.13.tgz ...
Starting to download PHPUnit-3.4.13.tgz (254,903 bytes)
.....................................................done: 254,903 bytes
install ok: channel://pear.phpunit.de/PHPUnit-3.4.13
phpunit安装完毕，可输入phpunit测试