Specifically, what does the ($c1 & 0x03) << 4
do?
Is 0x03 hex notation?
It does mean first operation do logically AND with HEX value 0x03(that is 3 in HEX or (0011) in Binary).and then left Shift 4 places.example
let u have $c = 34. then first it performs $c & 3 which is (100010 BITWISE AND 000011) which Gives you (000010) and then It shifts 4 digit on left position and restore new value in $c ie (100000) or 32 in decimal.
Hope it is Helpful.
Thanks
这将占用$c1
值的低两位,并将其向左移动4位。
Yes 0x is hex. That is doing a bitwise AND of $c1 and the hex 03 value, then left shifting the result 4 places (powers of 2).
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