The framework needs the following extension(s) installed and loaded: intl, mbstring.
安装Codeigniter 4.5.4，报错
The framework needs the following extension(s) installed and loaded: intl, mbstring. //意思是需要安装intl,mbstring
解决方法：
必须PHP8.1版本以上
1、修改php.ini，去掉intl,mbstring前面的分号
extension=intl
extension=mbstring
找到extension_dir，路径指向ext文件夹。
; On windows:
extension_dir = "ext"
