The PHP example does not work

Example for PHP CI does not work. Example of error:

Your requirements could not be resolved to an installable set of packages.
  Problem 1
    - Installation request for lorenzo/pinky 1.0.5 -> satisfiable by lorenzo/pinky[1.0.5].
    - lorenzo/pinky 1.0.5 requires ext-xsl * -> the requested PHP extension xsl is missing from your system.
  Problem 2
    - lorenzo/pinky 1.0.5 requires ext-xsl * -> the requested PHP extension xsl is missing from your system.
    - twig/inky-extra v3.0.3 requires lorenzo/pinky ^1.0.5 -> satisfiable by lorenzo/pinky[1.0.5].
    - Installation request for twig/inky-extra v3.0.3 -> satisfiable by twig/inky-extra[v3.0.3].
  To enable extensions, verify that they are enabled in your .ini files:
    - 
    - /usr/local/etc/php/conf.d/docker-php-ext-pdo_mysql.ini
    - /usr/local/etc/php/conf.d/docker-php-ext-sodium.ini
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.