PHP also gives you the get_called_class, which you will use heavily because many of the design patterns you'll implement require the class name of derived classes.

PHP还提供了get _ called _ class供您大量使用，因为您要实现的设计模式常常会需要衍生类的类名。

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Founder mutations are a class of disease-causing genetic mutations, each derived from its own ancestral "founder" in whom the mutation originated.

创始者突变是一类引起疾病的基因突变，每一种都源自其自身祖先的“创始者”。

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Kosan is in early human trials of epothilone-D, a potent variant of a promising new class of chemotherapy drugs derived from an African soil bacteria, Sorangium cellulosum.

FORBES: Innovators