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<?php interface Test { public function check(Test $x); } interface TestStrict extends Test { public function checkStrict(TestStrict $x); } class Foo implements TestStrict { //ok, exact match public function checkStrict(Test $x) {} //fail, but TestStrict > Test I.e. //if $x fullfills TestStrict, it 100% satisfy Test too. //so - why? public function check(Test $x) {} }
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