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mysqladmin: connect to server at 'localhost' failed     停止mysql服务 systemctl stop mysql     安全模式启动 chown -R mysql.mysql /var/run/mysqld/ mysqld_safe --skip-grant-tables &     无密码root帐号登...

导出镜像 docker save -o centos7.tar centos # 导入本地镜像 docker load --input centos7.tar docker ps -a docker export 7691a814370e > ubuntu.tar cat ubuntu.tar | docker import - tes

connect() failed (111: Connection refused) while connecting to upstream fastcgi://127.0.0.1:9000       netstat -ant | grep 9000   vim /etc/php/7.0/fpm/php-fpm.conf or /etc/php/7.0/fpm/pool.d/ww...

只需要里边的phpqrcode.php这一个文件就可以生成二维码了 我们需要用到里边的QRcode类（第2963行）的png()方法 public static function png($text, $outfile = false, $level = QR_ECLEVEL_L, $size = 3, $margin = 4, $saveandprint=false)