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1.1 KiB
1.1 KiB
Base classes and interfaces
Object
Object is the base class for many other Yii2 classes.
property feature
Why
To be able to make property public initially and then seamlessly make it
private or protected by adding getter and setter method. That will not
change API. Results in less repetitive code. Performance drop isn't significant.
callbacks and expressions
Object::newInstance method
This method is a powerful way to instantiate a class. Differences from new:
- Calls class constructor (same the
newoperator); - Initializes the object properties using the name-value pairs given as the last parameter to this method;
- Calls Initable::init if the class implements Initable.
Why
To support class dependencies and their lazy loading.
Initable interface
Developer will implement initable interface if running init() needed and will
skip it if not.
Why
Indicates where init() will be called and where not. More explicit than it was
in Yii 1.