Like most of us digital natives, I have a collected a lot of digital photographs.  Most of these are in a JPEG format.  A number of years ago, I played around with some PHP scripts to extract EXIF information from a collection of photographs.  Of course you need to first compile PHP with exif support.  Here is a simple starter script to get you going:

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I had to add a 10 ohm power resistor into the PSU so the Test PSU would come on line with no load present