oop - Why is it possible to have an interface without a return type in PHP? -

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Why is it possible to create an interface without specifying the return type? Why does not it waste this interface?

This makes it more obvious: 

  interface run {public function getInteger (); } Class applies MyString {public function myNumber () {} public function getInteger () {return "no number"; In every interface in Java,  integer ,  string  or  zero  
 
 I know that PHP is unfortunately typed in a loose Language but is not the solution to that problem? 
 
 Is return type like  Integer ?

The signal type for function / method arguments or return values ​​is only supported on PHP7.0 or later

Check the details here:

If you are using PHP5, then the current approved practice is to use comments to indicate "contract". 

  / ** * does something * @ layer intact ** / public event getInteger () {return 1; } If the code "contravenes the contract," then I suggest finding and repairing the original codec and filing the bug and / or setting it yourself if it is in your own codebase.

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