php - class "DOMDocument" not found in a Drupal 8 site -


i've found error on page in drupal 8 site; show message error when visit it:

error: class 'domdocument' not found in /var/www/vhosts/mysite/core/lib/drupal/component/utility/html.php on line 286

i'm using centos 6 , runned commands:

    yum install php71w-xml     sudo service httpd restart

i verified in php.ini: extensions php enabled dom, xml, xmlreader, xmlwrite not worked me.

can give me solution? i'm drupal 8, php 7.1, apache2.2


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