任务
解决导入时错误：您的站点遇到了致命错误，请查看您的站点的管理电子邮箱来获得指引。
过程
开启调试
通过修改配置文件wp-config.php
查看报错
Fatal error: Uncaught Error: Class 'DOMDocument' not found in /usr/share/nginx/html/wordpress/wp-content/plugins/wordpress-importer/parsers/class-wxr-parser-simplexml.php:18 Stack trace: #0 /usr/share/nginx/html/wordpress/wp-content/plugins/wordpress-importer/parsers/class-wxr-parser.php(17): WXR_Parser_SimpleXML->parse('/usr/share/ngin...') #1 /usr/share/nginx/html/wordpress/wp-content/plugins/wordpress-importer/class-wp-import.php(1218): WXR_Parser->parse('/usr/share/ngin...') #2 /usr/share/nginx/html/wordpress/wp-content/plugins/wordpress-importer/class-wp-import.php(177): WP_Import->parse('/usr/share/ngin...') #3 /usr/share/nginx/html/wordpress/wp-content/plugins/wordpress-importer/class-wp-import.php(55): WP_Import->handle_upload() #4 /usr/share/nginx/html/wordpress/wp-admin/admin.php(346): WP_Import->dispatch() #5 {main} thrown in /usr/share/nginx/html/wordpress/wp-content/plugins/wordpress-importer/parsers/class-wxr-parser-simplexml.php on line 18通过搜索，明白需要安装关于php的DOM扩展：php-xml
文档对象模型（DOM）是HTML和XML文档的编程接口。
安装PHP-XML
yum install php-xml但会报错：
Error: php72w-common conflicts with php-common-5.4.16-43.el7_4.x86_64
根据这篇有用的回答，解决方式是：
yum install php72w-xml
确定已经安装成功
此时，必须要重启你的php服务：
systemctl restart php-fpm导入成功！
