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Această extensie este EXPERIMENTALĂ. Comportamentul acestei extensii ߞ - inclusiv denumirile funcțiilor sale și orice alte aspecte documentate în privința acestei extensii ߞ - pot să fie modificate fără preaviz într-o versiune viitoare a PHP. Utilizați această extensie la propriul risc.

In Object Oriented Programming, it is common to see the composition of simple classes (and/or instances) into a more complex one. This is a flexible strategy for building complicated objects and object hierarchies and can function as a dynamic alternative to multiple inheritance. There are two ways to perform class (and/or object) composition depending on the relationship between the composed elements: Association and Aggregation.

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