Install php develop environment
brew install php
brew install composer
Create project using slim skeleton
composer create-project slim/slim-skeleton [my-app-name]
composer create-project slim/slim-skeleton slim-card
declare vs use vs require
declare 是一个用于设置脚本执行指令的结构，主要用于控制 PHP 的运行时行为。
语法：
declare (directive …