php add title to image


I would like to add a title to a png image in Arial. How can I do this.

I know I have to load the image with:
then use:
imagettftext($im, 10, 0, 10, 20, $black, $font, $text);

But with the above code the the text is in the image, I want it the be above the image. So I need to add some room (with white background) in the top of the image to add the text. How can I do this?
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get the x,y size of 1.png
create a new image of size x, (y+font height)
set the background color white
copy  1.png to the new image (offset to bottom)
add the text to the top white area
save the image

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DennieAuthor Commented:
how do I copy the image to the new image?
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