define()要大写吗？记着以前看过其他的PHP教程中，define()是大写的，好像大写跟小写是不一样的是吗，求哪位大神解释下

Answer 1

define() should be capitalized? I remember that in other PHP tutorials I have seen before, define() is in uppercase. It seems that uppercase and lowercase are different, right? Can someone please explain it - PHP Chinese website Q&A - Should define() be in uppercase? I remember that in other PHP tutorials I have seen before, define() is in uppercase. It seems that uppercase and lowercase are different, right? Can someone please explain it - PHP Chinese website Q&A

Take a look around and learn.

Answer 2

php中的变量和常量是区分大小写的，但是php中的类名和方法名，甚至一些关键字都是不区分大小写的，define这个关键字就是不区分大小写的