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Since PHP 8.1, you can use an "intersection type" (also known as "pure") that enforce that a given value belong to every types. For example this param needs to implement both ___Stringable___ and ___Countable___ interfaces:
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Since PHP 8.1, you can use an "intersection type" (also known as "pure") that enforce that a given value belong to every types. For example this param needs to implement both *Stringable* and *Countable* interfaces:
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```php
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function myFunction(Stringable&Countable $param): Stringable&Countable
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