声明常量时的PHP语法错误

The error I'm getting here is:

Parse error: syntax error, unexpected 'CASE' (T_CASE), expecting identifier (T_STRING) in [filename] on line 4

<?php

class PartCategories {
    const CASE = 1;
    const PROCESSOR = 2;
    const HARD_DRIVE = 3;
    const MEMORY = 4;
}

Can't say I've tried anything but for the life of me can't see what's wrong here.

Why is this a syntax error?

case or CASE is already reserved by PHP for the switch statement. You can't redefine this as a constant, just as you cant define a const FUNCTION or something similar.

You're going to have to change the name of the constant.

First of all you should know that PHP is not case sensitive. So "case", "Case", "caSE", "CAsE" and like are same thing.

And you already know that case is a php reserved keyword it can't be use for variable name.

You can initialize your class like $obj = new PartCategories();
or paRTCATEgories();
or PARTCATEGORIES();
mEANS tO sAY THAt PHp iS CaSE INSEnsitive.