常量定义后还能修改么？

Question

例如：

define('db_host', $ini)  ;

define('db_host','23213')  ;

Answer 1

Definitely not

Answer 2

Can constants be modified after they are defined? -PHP Chinese website Q&A-Can constants be modified after they are defined? -PHP Chinese website Q&A

Please watch and learn.

Answer 3

常量值被定义后，在脚本的其他任何地方都不能被改变，所以如果想修改的话，还是要回到定义常量的地方进行修改