P
parent class

See base class.

PHP Data Object (PDO)

A group of classes that provides a data-access abstraction layer, included by default with PHP version 5.1 and higher; drivers are available for databases commonly used with PHP

PHP Extension and Application Repository (PEAR)

A library of open-source code, organized into packages that are easily installed using the PEAR installer

polymorphism

Properly speaking, the ability to copy a child object into a variable of the parent type and still invoke the methods of the child against that parent object; used somewhat loosely when applied to PHP

private

A keyword used to modify the methods or data members of a class; private elements can only be accessed from within the class or indirectly ...

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