最近项目中有用到 phalcon框架进行开发
于是帮助测试是同学在centos下搭建phalcon环境，
直接打开根据官网文档源码安装，
phalcon官方文档
sudo yum install php-devel pcre-devel gcc make
git clone https://github.com/phalcon/cphalcon
cd cphalcon/build
sudo ./install
出现报错
php 5 is no longer supported
但是 php -v 得到的版本是 7.0.30
经过一番追查发现主机上有多个 php 版本 ，
php默认是php7.0
但是 phpize 的默认版本却不是 php7.0 自带的 而是系统自带的php5.0的版本，
所以安装的时候需要使用指定的phpize
安装命令改为
sudo ./install --phpize /usr/local/php7.0.30/bin/phpize --php-config /usr/local/php7.0.30/bin/php-config
编译成功 ！
当php.ini添加extension=phalcon.so后，重启php-fpm,
报错
PHP Warning: Cannot load module 'phalcon' because required module 'psr' is not loaded in Unknown on line 0
执行
php -m|gerp phalcon
发现扩展并没有加载进来
一追查才发现phalcon4.0加了依赖条件，必须先安装psr扩展
而3.X的版本不需要，
直接依据官方文档编译安装3.4 的版本，搞定！
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