Question: How to get camera serial number from EXIF ?

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Edit: some folk think that not all (or even many) cameras store serial number, but I tried four from different manufacturers and they do. So, let's just rephrase it as "How to get camera serial number from EXIF if there is any?"

Answer: 
Almost all DSLR cameras code the serial number into the EXIF info in the maker notes section. The reason most people don't see it in the EXIF info is that Adobe products all but ignore the maker notes section of the EXIF info. So if you are viewing the EXIF info using an Adobe product you won't see the serial number. But that doesn't mean it isn't there, it just means Adobe isn't displaying it.
You can use [`exif_read_data`](http://www.php.net/manual/en/function.exif-read-data.php) to access EXIF information in php. A good code sample on how to use this command is shown in the manual within the link below.

<http://www.php.net/manual/en/function.exif-read-data.php>

But afaik currently not many cameras code the serial numbers into the EXIF blocks.