php-pear的使用
最近要装centreon，它的系统要求有很多pear的包。
查了一下，原来pear是php的一个官方框架，大概就类似于python的官方库和ruby的gem吧？
在linux下可以用pear install来安装各种php的开发工具。
在linux下安装pear
$ php go-pear.phar
但是pear还是没有yum那么方便，我尝试运行：
-o 表示仅安装需要的依赖
最后报错了，说Validate这个包没有stable版本。
去pear官网看了一下，Validate这个包从alpha 0.0.2版本开始，直到现在的0.8.4，居然一直是beta版本……
解决方法：
使用pear install -f channel://pear.php.net/Validate-0.8.4
-f 表示强行安装
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