composer install 报错！！

Question

laravel 项目 执行命令： ubuntu@ubuntu:/var/www/html/laravel$ composer install 报错如下： Loading composer repositories with package information Installing dependencies (including require-dev) from lock file Your requirements could not be resolved to an installable set of packages. Problem 1 - Installation request for phpunit/php-code-coverage 4.0.8 -> satisfiable by phpunit/php-code-coverage[4.0.8]. - phpunit/php-code-coverage 4.0.8 requires ext-dom * -> the requested PHP extension dom is missing from your system. Problem 2 - Installation request for phpunit/phpunit 5.7.26 -> satisfiable by phpunit/phpunit[5.7.26]. - phpunit/phpunit 5.7.26 requires ext-dom * -> the requested PHP extension dom is missing from your system. To enable extensions, verify that they are enabled in those .ini files: - /etc/php/7.0/cli/php.ini - /etc/php/7.0/cli/conf.d/10-mysqlnd.ini - /etc/php/7.0/cli/conf.d/10-opcache.ini - /etc/php/7.0/cli/conf.d/10-pdo.ini - /etc/php/7.0/cli/conf.d/20-calendar.ini - /etc/php/7.0/cli/conf.d/20-ctype.ini - /etc/php/7.0/cli/conf.d/20-curl.ini - /etc/php/7.0/cli/conf.d/20-exif.ini - /etc/php/7.0/cli/conf.d/20-fileinfo.ini - /etc/php/7.0/cli/conf.d/20-ftp.ini - /etc/php/7.0/cli/conf.d/20-gd.ini - /etc/php/7.0/cli/conf.d/20-gettext.ini - /etc/php/7.0/cli/conf.d/20-iconv.ini - /etc/php/7.0/cli/conf.d/20-json.ini - /etc/php/7.0/cli/conf.d/20-mbstring.ini - /etc/php/7.0/cli/conf.d/20-mcrypt.ini - /etc/php/7.0/cli/conf.d/20-mysqli.ini - /etc/php/7.0/cli/conf.d/20-pdo_mysql.ini - /etc/php/7.0/cli/conf.d/20-phar.ini - /etc/php/7.0/cli/conf.d/20-posix.ini - /etc/php/7.0/cli/conf.d/20-readline.ini - /etc/php/7.0/cli/conf.d/20-shmop.ini - /etc/php/7.0/cli/conf.d/20-sockets.ini - /etc/php/7.0/cli/conf.d/20-sysvmsg.ini - /etc/php/7.0/cli/conf.d/20-sysvsem.ini - /etc/php/7.0/cli/conf.d/20-sysvshm.ini - /etc/php/7.0/cli/conf.d/20-tokenizer.ini You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode. 截图：

Answer 1

你安装的 phpunit/php-code-coverage 4.0.8 和 phpunit/phpunit 5.7.26 都需要 ext-dom 这个PHP扩展。

安装下 ext-dom 并在 php.ini 里启用即可。