composer安装html

执行 composer require illuminate/html

返回

Using version ~5.0 for illuminate/html
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

Problem 1
- laravel/framework v5.0.16 requires ext-mcrypt * -> the requested PHP extension mcrypt is missing from your system.
- laravel/framework v5.0.16 requires ext-mcrypt * -> the requested PHP extension mcrypt is missing from your system.
- Installation request for laravel/framework == 5.0.16.0 -> satisfiable by laravel/framework[v5.0.16].

Installation failed, reverting ./composer.json to its original content.