Is there a difference between NULL and null in PHP? Sometimes they seem to be interchangeable and sometimes not.
PHP中NULL和NULL有区别吗?有时它们似乎可以互换，有时则不能。
edit: for some reason when I read the documentation linked to in the answer (before posting this question) I read it as "case sensitive" instead of "case insensitive" which was the whole reason I posted this question in the first place...
编辑:由于某种原因，当我读到与答案相关的文档(在发布这个问题之前)时，我把它读成“区分大小写”而不是“区分大小写”，这就是我最初发布这个问题的原因……
2 个解决方案
#1
105
Null is case insensitive.
零是不区分大小写。
From the documentation:
从文档:
There is only one value of type null, and that is the case-insensitive keyword NULL.
类型为null的值只有一个，即不区分大小写的关键字null。
#2
8
There is no difference. Same type just its a case insensitive keyword. Same as True/False etc...
没有区别。同样的类型只是一个不敏感的关键字。一样的真/假等等……
#1
105
Null is case insensitive.
零是不区分大小写。
From the documentation:
从文档:
There is only one value of type null, and that is the case-insensitive keyword NULL.
类型为null的值只有一个，即不区分大小写的关键字null。
#2
8
There is no difference. Same type just its a case insensitive keyword. Same as True/False etc...
没有区别。同样的类型只是一个不敏感的关键字。一样的真/假等等……