Bitwise comparison in PHP

Question

I confess I don't really know what I'm doing! I'm pulling some data from SecondLife and parsing it in PHP. The data is an integer from llGetRegionFlags which, in my case, returns 1048592

Now I need to do a bitwise comparison in PHP to figure out which flags are true/false. For example 0x00000040 is used for the "block terraform" flag.

The notations are in hex for each flag, and I have an integer to test against, and the PHP manual suggests integers and shows examples in binary.

So my question really is, given an integer and some hex flags, how do I go about doing the bitwise comparison in PHP? Brainfried! Thanks in advance

Answer 1

To determine if a particular bit is turned on, use the & (AND) operator:

if ($data & 0x00000040) {
    // block terraform flag is true
}

If the bit is turned on, the AND operator will return a positive number. If it is turned off, then the AND operator will result in a zero.