php7.1遇到的错误

php -v
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 7.1.0-5+deb.sury.org~trusty+1 (cli) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.1.0-dev, Copyright (c) 1998-2016 Zend Technologies

    with Zend OPcache v7.1.0-5+deb.sury.org~trusty+1, Copyright (c) 1999-2016, by Zend Technologies

解决方法：

    apt-cache search php7.1    sudo apt-get install libapache2-mod-php7.1     sudo apt-get install libphp7.1-embed

 可能是之前安装过了但是包更新了或者是没安装过