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<?php spl_autoload_register(function($class) { if ($class === 'A') { class A { public function foo($x): B { return new B; } } } else if ($class === 'B') { class B extends A { public function foo($x): C { return new C; } } var_dump(new B); } else if ($class === 'C') { class C extends B implements N { } } }); new C;
Output for 8.5.0 - 8.5.9
object(B)#2 (0) { } Fatal error: During inheritance of C with variance dependencies: Uncaught Error: Interface "N" not found in /in/oUoG2:18 Stack trace: #0 /in/oUoG2(23): {closure:/in/oUoG2:3}('C') #1 {main} in /in/oUoG2 on line 18 Stack trace: #0 /in/oUoG2(23): {closure:/in/oUoG2:3}('C') #1 {main}
Process exited with code 255.
Output for 8.4.1 - 8.4.24
object(B)#2 (0) { } Fatal error: During inheritance of C with variance dependencies: Uncaught Error: Interface "N" not found in /in/oUoG2:18 Stack trace: #0 /in/oUoG2(23): {closure:/in/oUoG2:3}('C') #1 {main} in /in/oUoG2 on line 18
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.32
object(B)#2 (0) { } Fatal error: During inheritance of C with variance dependencies: Uncaught Error: Interface "N" not found in /in/oUoG2:18 Stack trace: #0 /in/oUoG2(23): {closure}('C') #1 {main} in /in/oUoG2 on line 18
Process exited with code 255.
Output for 7.4.0 - 7.4.33
object(B)#2 (0) { } Fatal error: During inheritance of C with variance dependencies: Uncaught Error: Interface 'N' not found in /in/oUoG2:18 Stack trace: #0 [internal function]: {closure}('C') #1 /in/oUoG2(23): spl_autoload_call('C') #2 {main} in /in/oUoG2 on line 18
Process exited with code 255.
Output for 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Fatal error: Declaration of B::foo($x): C must be compatible with A::foo($x): B in /in/oUoG2 on line 11
Process exited with code 255.
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