主机，用户名，密码都正确
服务器上安装了多个mysql，多个php版本
关联:
/usr/local/php/etc/php.ini
[MySQLi]
mysqli.default_socket =/opt/lampp/var/mysql/mysql.sock
[Pdo_mysql]
; Default socket name for local MySQL connects. If empty, uses the built-in
; MySQL defaults.
pdo_mysql.default_socket=/opt/lampp/var/mysql/mysql.sock
sudo /etc/init.d/php-fpm start
Starting php-fpm done
nginx转发到php-fpm
/usr/local/nginx/conf/enable-php.conf
/usr/local/php/etc/php-fpm.conf
/usr/local/php/etc/php-fpm.d/www.conf
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