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07-12-2010, 07:59 PM
Salathe is offline Salathe
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To confirm santa's suggestion, getimagesize() does exactly what you're looking for and will likely be as fast as you can get for doing this task.

The underlying C code for the function (for the common image types) literally reads the first few bytes of the file for the required width/height information; you can't get much more streamlined than that.

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