Getting Fatal error when running ZF2 project on php 7.1.1 Zend\Stdlib\PriorityQueue contains 1 abstract method - zend-framework2

I'm getting the following Fatal error when running a ZendFramework2 project on PHP 7.1.1.
The error is:
Fatal error: Class Zend\Stdlib\PriorityQueue contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (Serializable::unserialize) in F:\xampp\htdocs\MyZF2Site\vendor\zendframework\zendframework\library\Zend\Stdlib\PriorityQueue.php on line 28
What could be the sulution?


I had the same problem. Already I solved it.
PHP 7.1.9
Fatal error: Class Zend\Stdlib\PriorityQueue contains 5 abstract methods...
Change PHP 7.0.23. To change is very easy for me because I use wampserver.
It's work 0k ¡
Againg to change to PHP 7.1.9.
It worked 0k forever. Why?¡¡ I don't know. I think it is issue cache.
slds


Almost always there are some backwards incompatible changes, in this case you can check out those changes here http://php.net/manual/en/migration71.incompatible.php.
Here http://php.net/manual/en/appendices.php you can see changes in previous versions.
You did not say which exactly version of ZF2 you use.

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