WordPress Installer can support different environements, which allow you to identify and make adjustments if you work locally on your dev instance, if you want to show your modifications to client on the staging instance, or if you want to push on the production instance.

For example – by default – if you work on your dev instance, the WordPress Installer will install extra plugins « QueryMonitor » & « User Switching » ; they will not be installed on your others environments.

? In Robert Server, default « Composer » uses a PHP version < 7.1 which causes troubles with requires packages. Use this command instead to use PHP 7.1 with Composer.

MAGINA_ENV=preprod /opt/plesk/php/7.1/bin/php /usr/lib/plesk-9.0/composer.phar update --no-dev