BBcode plugins with no ending tags

[bobmonkey380]

Hello.

I have already made custom bbcode tags with php using plugins.
But now I want to make a bbcode without an ending tag.

Like, for example, [randomquote]. Without an ending.

Also, the bbcode tag I am making returns a random element. But when I use the bbcode hook and use the bbcode parser, for each person who views the tag, since it's random, they get a different result.

I want the result to be the same for everybody. So instead of using the bbcode parser I want to replace the bbcode before the bbcode is parsed, so the random result returned by the tag is the same for everyone.

Thanks in advance.