作者 php中有 pecl 和 pear 。pecl 是php社区扩展库 ， pear PHP扩展和应用仓库 。两者都是增强php功能的扩展。pear 的写扩展使用 php 代码写的，属于应用层的扩展。而 pecl 的扩展通常是c写的，用来扩展php的底层功能。比如多线程 、异步 。
pecl 和 pearh
pecl (The PHP Extension Community Library)
pear(PHP Extension and Application Repository)
进入php的命令目录
这里是源代码安装的
cd /usr/local/php/bin
phar phar.phar php php-config phpdbg phpize
pecl 安装的步骤
wget http://pear.php.net/go-pear.phar -O go-pear.php
./php go-pear.php
Below is a suggested file layout for your new PEAR installation. To
change individual locations, type the number in front of the
directory. Type 'all' to change all of them or simply press Enter to
accept these locations.
1. Installation base ($prefix) : /usr/local/php
2. Temporary directory for processing : /tmp/pear/install
3. Temporary directory for downloads : /tmp/pear/install
4. Binaries directory : /usr/local/php/bin
5. PHP code directory ($php_dir) : /usr/local/php/share/pear
6. Documentation directory : /usr/local/php/docs
7. Data directory : /usr/local/php/data
8. User-modifiable configuration files directory : /usr/local/php/cfg
9. Public Web Files directory : /usr/local/php/www
10. System manual pages directory : /usr/local/php/man
11. Tests directory : /usr/local/php/tests
12. Name of configuration file : /usr/local/php/etc/pear.conf
可以看到pecl 已经安装
ls
pear peardev pecl phar phar.phar php php-config phpdbg phpize
pecl 安装 swoole
pecl install swoole