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<?php namespace Test; class Element { } class Hello { } class Super extends Hello { public function test() { var_dump($this->getOptions(new Element)); } protected function getOptions(Element $element) : array { return null; } } class Child extends Super { protected function getOptions(Element $element) : array { return ["ok", "Test"]; } } $super = new Super(); $super->test(); $child = new Child(); $child->test();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: Test\Super::getOptions(): Return value must be of type array, null returned in /in/eQqqZ:19 Stack trace: #0 /in/eQqqZ(15): Test\Super->getOptions(Object(Test\Element)) #1 /in/eQqqZ(32): Test\Super->test() #2 {main} thrown in /in/eQqqZ on line 19
Process exited with code 255.

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