SplObjectStorage::getHash()

(PHP 5 >= 5.4.0, PHP 7)

Calculate a unique identifier for the contained objects

说明

This method calculates an identifier for the objects added to an SplObjectStorage object.

The implementation in SplObjectStorage returns the same value as spl_object_hash().

The storage object will never contain more than one object with the same identifier. As such, it can be used to implement a set (a collection of unique values) where the quality of an object being unique is determined by the value returned by this function being unique.

参数

The object whose identifier is to be calculated.

返回值

A string with the calculated identifier.

错误／异常

A RuntimeException is thrown when the returned value is not a string.

范例

SplObjectStorage::getHash() example

以上例程的输出类似于：

2
3

参见

• spl_object_hash()返回指定对象的hash id

This also appears to be the function which gets used within the contains() function, so if all the objects you are storing already have a unique id you can overwrite this function with your own class. 

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