PHP Image MySQL PDO: Save and show image from MySQL blob using PDO

This class can save and show image from MySQL blob using PDO.

It can take an image from a file or uploaded via a form and inserts a record in a given MySQL table using PDO prepared query pulling the file data into a BLOB field.

The class can execute a SELECT query to read a previously stored image file from the same database table and serves it as the current script output with a content type also stored in the same MySQL database table record.