PHP 5.x是否具有某种HashSet或Set Class？

我习惯了 Java,我有HashSets,ArrayLists和其他Collections.但是我现在正在处理一个 PHP项目.

我需要创建一个集合,用对象填充该集合(在这种情况下为Strings),但是Set只能包含每个对象一次.此外,如果存在,我想从此集合中删除最终的某个对象.这将很容易与Java集合类.但是如何在PHP中实现呢？

有没有array()的方法我失踪了？我使用PHP 5.3.

PHP文档说：

An array in PHP is actually an ordered map. A map is a type that
associates values to keys. This type is optimized for several
different uses; it can be treated as an array,list (vector),hash
table (an implementation of a map),dictionary,collection,stack,
queue,and probably more. As array values can be other arrays,trees
and multidimensional arrays are also possible.

所以maybee(！)你不需要一个HashSet,因为正常的数组已经被实现为一种优化的索引结构:)