PHP 4 added the ability to pass and return by reference.

PHP 4添加了基于引用的传递和返回功能。

youdao

The paper makes in-depth analysis about essence of call by values and call by references, return by value and return by reference, also explains these through some examples.

笔者系统地分析了函数参数传递中值调用和引用调用以及函数值返回和引用返回的本质，并举例进行了说明。

youdao

Money should be used for a proper economic purpose and not treated as a commodity on which a return can be made by reference to time.

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