安装pear、pecl特别简单，只需要两步。
wget http://pear.php.net/go-pear.phar php go-pear.phar
[root@localhost bin]# ls -l
-rw-r--r-- 1 root root 4082712 Mar 26 2013 go-pear.phar
-rwxr-xr-x 1 root root 841 Mar 5 11:28 pear
-rwxr-xr-x 1 root root 862 Mar 5 11:28 peardev
-rwxr-xr-x 1 root root 778 Mar 5 11:28 pecl