Help with custom bbcode related to text size

[MustardCat]

Currently I'm using bbcode for text size that matches what is currently used on this board, such as:

size 50 = tiny
size 85 = small
size 100 = normal
size 150 = large
size 200 = huge


But I need to add support for bbcode that is to be copied over from a vbulletin board. Users will be manually copying posts that contain bbcode for size that looks like this:

Code: Select all

[size="6"]Some text[/size]

The size can range 1 - 7, 7 being the largest. Obviously this makes the text microscopic when used with phpBB. (It does still work with those quotes in there.)


I don't know php but I do know a little c++ so I need help on how exactly to code this. Here is an example in pseudocode of what I want to do:

if size = 1
set font-size to 50%

if size = 2
set font-size to 100%

if size = 3
set font-size to 120%

if size = 4
set font-size to 140%

if size = 5
set font-size to 160%

if size = 6
set font-size to 180%

if size = 7
set font-size to 200%

I would like this to function in addition to (not replace) the default bbcode for size, since I don't want people formatting future posts using the old sizes. I'm essentially trying to add backwards compatibility that bumps those smaller sizes from vbulletin into readable text.

I've looked through bbcode.php a bit but I'm lost, I need some help from someone who knows what they are doing. Thank you.