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Equivalent to Java HashSet in PHP

I am relatively new to php and have difficulty understanding the correct data structure. Say I have a FooBar class with equals()and hashCode()that has been correctly implemented. What is the collection in php (if any) that looks most like Java hashSet? I need a collection of objects without duplicates. Someone suggested using an array and a function array_key_exists, but I'm just wondering if there is another way to do this?

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Starting with version 5.2, Php offers SplObjectStorage, which offers the functionality of the Java Set:

  • It takes care of uniqueness (the same object cannot be added twice)
  • Simple collection iteration

http://technosophos.com/content/set-objects-php-arrays-vs-splobjectstorage, ,

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PHP equals() hashCode(). , spl_object_hash(). SplObjectStorage , . SplObjectStorage::getHash($object) , SplObjectStorage.

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