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