Solve php-problem: Class ' simplexmlelement ' not found in

1. Questions

In Ubuntu 16.10, learning php, learning how to generate XML files in PHP, encountered this problem:

PHP Fatal error:class ' classname\simplexmlelement ' not found in/var/www/html/.../reg.class.php on line 40;

2. Resolve

2.1 Installationphp7.0-xml。

      在ubuntu中可以使用"sudo apt-get install php7.0-xml"进行安装。

2.2 Restart Apache service.

在ubuntu中可以使用“sudo service apache2 restart”重启apache服务。

Finally, the problem is solved.

Solve php-problem: Class ' simplexmlelement ' not found in