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- All framework classes are now namespaced, and the name prefix `C` is removed.
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- The format of path alias is changed to `@yii/base/Component`.
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In 1.x, this would be `system.base.CComponent`. See guide for more details.
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- The root alias `@yii` now represents the framework installation directory.
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In 1.x, this is named as `system`. We also removed `zii` root alias.
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- `CList` is renamed to `Vector`, and `CMap` is renamed to `Dictionary`.
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Other collection classes are dropped in favor of SPL classes.
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- `CFormModel` is removed. Please use `yii\base\Model` instead.
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