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<?php trait SmartObject { public function __call(string $name, array $args) { return 'smart ' . $name; } } class Component { use SmartObject; } class FormControl extends Component { public function __call(string $name, array $args): mixed { return 'control ' . $name; } } class CustomFormControl extends FormControl { use SmartObject; } var_dump((new FormControl)->foo()); var_dump((new CustomFormControl)->foo());
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Fatal error: Declaration of SmartObject::__call(string $name, array $args) must be compatible with FormControl::__call(string $name, array $args): mixed in /in/35EZW on line 4
Process exited with code 255.
Output for 7.0.6 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33
Fatal error: Declaration of SmartObject::__call(string $name, array $args) must be compatible with FormControl::__call(string $name, array $args): mixed in /in/35EZW on line 19
Process exited with code 255.
Output for 7.0.0 - 7.0.5
Warning: Declaration of SmartObject::__call(string $name, array $args) should be compatible with FormControl::__call(string $name, array $args): mixed in /in/35EZW on line 19 Fatal error: Uncaught TypeError: Return value of FormControl::__call() must be an instance of mixed, string returned in /in/35EZW:15 Stack trace: #0 /in/35EZW(23): FormControl->__call('foo', Array) #1 {main} thrown in /in/35EZW on line 15
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/35EZW on line 14
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_STRING in /in/35EZW on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/35EZW on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/35EZW on line 3
Process exited with code 255.

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