Documentation on bitfields

[Dilmah]

I've searched google and here, I know about storing them, reading them from the database and working out values.

Can anyone point me to docs about decoding a field value into bits?

Cheers.

[Opserty]

Could do with this too. I couldn't find much in the way of a tutorial either last time I searched.

[Dismounted]

$boolean = $totalbits & $bitvalue;