PHP一些扩展在编译的时候没有安装怎么办？
我们在配置Web环境的时候，有时候会根据现有要求，编译出的环境仅仅满足当前的需要。
但在后期随着业务的发展或架构升级，需要一些PHP新的扩展，这时候我们就要动态编译一下PHP扩展。
今天重新配置一个虚拟主机，运行新的框架报fileinfo不存在，得到Mine类型报错，检测发现在升级PHP的时候禁用了fileinfo，所以现在要动态编译fileinfo扩展。
方法其实很简单！
1、首先检测我们需要的扩展是否可用，同时PHP版本是多少？
以fileinfo为例
/usr/bin/php -i|grep fileinfo
若出现 fileinfo fileinfo support => enabled 则代表fileinfo扩展可用,否则不可用。
查看PHP版本：
/usr/bin/php --version
结果可能如下：
PHP 5.6.19 (cli) (built: Mar 3 2016 07:57:20)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
with Xdebug v2.4.0, Copyright (c) 2002-2016, by Derick Rethans
2、找到PHP源码
如果没有，请先下载当前环境的版本号。本地已有源码，请切换到源码目录。
cd /root/soft/php-5.6.19/ext
ext是PHP下扩展目录，里面都是PHP的扩展
3、如何动态编译扩展，以fileinfo扩展为例
cd fileinfo/usr/local/php/bin/phpize ----给PHP动态添加扩展命令，在php的bin目录下./configure -with-php-config=/usr/local/php/bin/php-configmake && make install
4、在php.ini里添加扩展名称
vi /etc/php.iniextension=fileinfo.so --添加扩展名称
其它扩展类似
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