How to make smart imagecreate for text preview

[Grumps]

I am already having a imagecreate script for preview. Im trying to alter the imagecreate to get to the next line if it reaches near the next end of the width limit.

For example:
Width: 100px
Height: 200px

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Everything is written in a single line but how do i enable a <br> within the imagecreate without using any <br> in my input.

If you're still unclear please refer to this site

betterfonts(dot)com

It accepts input in one single line and the script will automatically break the text into the following line. How do you do that?

And do i make center align for imagecreate()

Thanks.