Antes mesmo de começar o curso de Xdebug me deparei com um erro na preparação do ambiente. O erro foi:
Your requirements could not be resolved to an installable set of packages.
Problem 1
- Installation request for phar-io/manifest 1.0.3 -> satisfiable by phar-io/manifest[1.0.3].
- phar-io/manifest 1.0.3 requires ext-dom * -> the requested PHP extension dom is missing from your system.
Problem 2
- Installation request for phpunit/php-code-coverage 7.0.3 -> satisfiable by phpunit/php-code-coverage[7.0.3].
- phpunit/php-code-coverage 7.0.3 requires ext-dom * -> the requested PHP extension dom is missing from your system.
Problem 3
- Installation request for phpunit/phpunit 8.1.5 -> satisfiable by phpunit/phpunit[8.1.5].
- phpunit/phpunit 8.1.5 requires ext-dom * -> the requested PHP extension dom is missing from your system.