The command is: /etc/rc.d/init.d/httpd restart

chown -R mysql:mysql directory name change file attributes

mysqladmin -u root -p password'new password' set password

apt-get remove remove software

apt-get clean

/etc/rc.d/init.d/mysqld restart

php configures session, mainly apache

/etc/init.d/apache2 restart

/etc/init.d/mysql restart