how would i go about this [PHP]

[donatastommy]

so there would be different tags (about 20) in 3 different categories like size, color, etc

 

[bold][/bold], 
[red][/red], etc
[size=75][/font, etc]

 

now i would want a user to enter a word like "hello"

and i would want the string to be inside 1 of each of those categories which are picked randomly

for example

 

[bold][red][font=times new roman]hello[/bold][/red][/font]

[Ch0cu3r]

The text in square brakets is usually referred to as bbcode. Google for bbcode and you'll get tones of parsers/tutorials. See what you will come up with yourself.