PHP Warning: PHP Startup: Unable to load dynamic library

Question

When I run this command php -v
this error comes up:

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

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

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
PHP 7.1.5-1+deb.sury.org~trusty+2 (cli) (built: May 22 2017 13:39:01) ( NTS )

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Answer 1

I found almost the same problem with xml after linux update (and PHP 7.0 -> 7.1 with it).

The solution for me was pretty simple:

sudo apt install php7.1-xml