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PDO: Database connections and abstraction

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PDO stands for PHP Data Objects which is a powerful database data abstraction class as a core library in all versions of PHP since 5.1 providing a uniform data access interface with prepared statements, bound parameters and dynamically loadable drivers under the same API.

Now we're talking abstraction here, this means that it can use all the common features such as prepared statements, transactions, and rollback features on each of these DBMS (database management system) engines in a secure and simple manner where available. Most supported engines of which are:

* DBLIB: FreeTDS / Microsoft SQL Server / Sybase
* Firebird (http://firebird.sourceforge.net/): Firebird/Interbase 6
* IBM (IBM DB2)
* INFORMIX - IBM Informix Dynamic Server   more...

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