1、找到lnmp的安装目录
解压php
tar -xvf php-7.1.5.tar.bz2
cd php-7.1.5
cd ext/fileinfo
2、安装扩展
/usr/local/php/bin/phpize
./configure -with-php-config=/usr/local/php/bin/php-config
make && make install
3、修改php.ini ,添加fileinfo扩展
cd /usr/local/php/etc/
vi php.ini
extension = fileinfo.so
重启php
lnmp php-fpm restart