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Is there a relatively simple way (perhaps regular expressions?) of detecting the dimensions -height & width – of an image from a base64 string (and perhaps the filesize)? That is to say without actually creating an image resource?
Decode the base64, and use
getimagesizefromstring().http://www.php.net/manual/en/function.getimagesizefromstring.php
This will be way more reliable than trying to write your own handling of each image type available.