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<?php interface TestInterface { public function test(): TestInterface; } trait TestTrait { public function test(): TestInterface { return $this; } } class TestClass implements TestInterface { use TestTrait; public function test2() : self { return $this; } } $test = new TestClass; var_dump($this->test2());
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Fatal error: Uncaught Error: Using $this when not in object context in /in/OIK2U:21 Stack trace: #0 {main} thrown in /in/OIK2U on line 21
Process exited with code 255.
Output for 5.5.0 - 5.5.37, 5.6.0 - 5.6.23
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/OIK2U on line 3
Process exited with code 255.
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