BIT operations in PHP (a simple example)

[chunkyslink]

http://13.7billionyearslater.net/2010/07/16/using-bit-operations-in-php-an-example/

[duskwuff]

Generally best avoided in web applications, as all the database engines I'm familiar with can't use indexes for bitwise operations.

[dreur]

An interesting way of dealing with flags depending on the kind of app you are developing, I wouldn't use that technique often.