什么情况：

D:myphp_wwwPHPTutorialWWWPHPDemolaravel>composer create-project laravel/laravel Laravel --prefer-dist "5.5.*"

  [InvalidArgumentException]

  Impossible de trouver le package laravel/laravel avec la version 5.5.* une version installable en utilisant votre version PHP 5.4.45.

create-project [-s|--stability STABILITY] [--prefer-source] [--prefer-dist] [--repository REPOSITORY] [ --repository-url REPOSITORY

-URL] [--dev] [--no-dev] [--no-custom-installers] [--no-scripts] [--no-progress] [--no -secure-http] [--keep-vcs] [--remove-vcs] [-

-no-install] [--ignore-platform-reqs] [--] [<package>] [< répertoire>] [<version>]