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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; } } class TestClass2 extends TestClass {} $test = new TestClass; $test2 = new TestClass2; var_dump($test->test(), $test2->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 - 8.3.4, 8.3.6
object(TestClass)#1 (0) { } object(TestClass2)#2 (0) { }
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 object(TestClass)#1 (0) { } object(TestClass2)#2 (0) { }
Output for 5.5.0 - 5.5.37, 5.6.0 - 5.6.23
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/nHTkN on line 3
Process exited with code 255.

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