Comments on: Saving Database Space through Bit-masking

By: jktawer

jktawer — Thu, 15 Oct 2009 07:38:50 +0000

You got a nice blog up there.

respect
jaine
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pass a the drug test | pass a drug test | pass drug testing

By: Jorge

Jorge — Thu, 02 Oct 2008 18:32:03 +0000

I am using the same logic on a project, a very quick way to get around using reference tables. Good article, great ammunition in the tech group for my idea!

By: gostyloj

gostyloj — Sat, 13 Sep 2008 23:55:22 +0000

Good point Mattias. Just to explain a bit further what the operator notation is, the ‘&’ will do a bit comparison where both members in the comparison need to have that bit set to 1. Because you are doing the AND operator all the bit places you don’t care about need to be set to 1 so they maintain their value. The ‘~’ operator inverts all the bits in the value so where a variable might look like 00010000, the inverse of that would look like 11101111.

By: Mattias

Mattias — Sat, 13 Sep 2008 17:33:45 +0000

Might want to note that in order to take off one of the researches (for some unknown reason) you need to AND with the complement of the bit.
For example, if you had picked the g_shield_research and want to degrade it or something you use:

$newPlayerResearch = $element->research &~$g_shield_research;

By: Blair Beckwith

Blair Beckwith — Fri, 05 Sep 2008 11:58:38 +0000

These tutorials are simply amazing! Thank you do much for writing them! You definately have a new fan.