PHP Warning: PHP Startup: Unable to load dynamic library : <p>When I run this command <code>php -v</code><br>
this error comes up:</p>

<blockquote>
  <p>PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php/20160303/dom.so' - /usr/lib/php/20160303/dom.so: undefined symbol: php_libxml_node_free_list in Unknown on line 0  </p>
  
  <p>PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php/20160303/xmlreader.so' - /usr/lib/php/20160303/xmlreader.so: undefined symbol: dom_node_class_entry in Unknown on line 0  </p>
  
  <p>PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php/20160303/xsl.so' - /usr/lib/php/20160303/xsl.so: undefined symbol: dom_node_class_entry in Unknown on line 0<br>
  PHP 7.1.5-1+deb.sury.org~trusty+2 (cli) (built: May 22 2017 13:39:01) ( NTS )  </p>
  
  <p>Copyright (c) 1997-2017 The PHP Group
  Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies
      with Zend OPcache v7.1.7-1+ubuntu14.04.1+deb.sury.org+1, Copyright (c) 1999-2017, by Zend Technologies</p>
</blockquote>
