PHP5 Join mssql2005 database table image field picture display

PHP5 Connecting an image field in a mssql2005 database table display
Language is PHP5
Database is mssql2005

A field in a table [NR] stores a picture that is of type image type

Now want to achieve
1) Determine whether the content in NR is a picture, an HTML page, or a PDF file

2) The type judgment is not stored in another field.

If it is implemented. For example, the contents of the Nr field is JPG, then how to display it?

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Http://blog.chinaunix.net/uid-12877464-id-2911978.html

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