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9 Cards in this Set

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What is session tracking and how does it work?

PHP protocol for maintaining a state



A session is started and a random ID is assigned to that user. I'd is stored in a cookie but state information is stored on the server. Session variable can be retrieved by using the session ID and client.

What are some basic methods

__construct __destruct __tostring

Private, public, protected variables

Private: only for class, public: anywhere, protected: class and subclasses

Serialize (), unseralize()

For PHP objects. This is good if you want to save an object into a file or a cookie and then later restore it

Relational database

Data stored I in tables and relate the data from one table to that of another

Schema

A set of tabke design that determine a database

Data relationships

One to one


One to many


Many to many

Inner join

Associates each row in one table with each row in the other



MySql Command Structure