troubleshooting Question

calculate height based on width

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ellandrdFlag for Ireland asked on
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i want to create a small image with a max width of 500 pixels from a large image.  

i want the height to be based on width/height ratio of the large image so the small image is kept proportional.

but not sure how to work out all the calculations for the new height to use in the imagecopyresized function.

need some guidelines and help please.

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