Enabling second byte (bit shifting)

Question

How do I enable the second byte in 2 byte structure with help of bit shifting?

I want this result:

[x][x][x][x][x][x][x][x]|[ ][ ][ ][ ][ ][ ][ ][ ]
[----- second byte ----]|[----- first byte -----]

This is not working:

$options = 1 << 0xFF;

Answer 1

value << number_of_bits

So

$options = 0xff << 8;

Alternatively,

$options = 0xff00;

since two hexadecimal digits form one byte.