1-1 first class

1-2 Properties and methods

1-3 class syntax

1-4 Changes in attribute assignment

1-5 The relationship between classes and objects

1-6 who is this

1-7 Encapsulate Mysql class

1-8 Constructor and Destructor

1-9 class encapsulation

1-10 Class inheritance

1-11 final classes and final methods

1-12 Detailed explanation of the three permissions

1-13 Static properties and static methods

1-14 class constant

1-15 Singleton pattern

1-16 self and parent

1-17 magic method

1-18 The meaning of magic methods

1-19 autoload

1-20 Abstract classes and abstract methods

1-21 The concept of interface

1-22 Interface syntax

1-23 Exception handling

1-24 Namespaces

1-25 late binding

1-26 overloaded static

1-27 Polymorphism

1-28 Encapsulated database (Part 1)

1-29 Encapsulated database (Part 2)

1-30 Package file upload