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<?hh interface StringConverter { public function toUpperCase(string $str) : string; } class Test implements StringConverter { public function toUpperCase(string $str) : string { return strtoupper($str); } } $t = new Test; var_dump($t->toUpperCase('re4k'));
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.32, 7.2.29 - 7.2.33, 7.3.16 - 7.3.31, 7.4.3 - 7.4.32, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.20, 8.3.0 - 8.3.8
<?hh interface StringConverter { public function toUpperCase(string $str) : string; } class Test implements StringConverter { public function toUpperCase(string $str) : string { return strtoupper($str); } } $t = new Test; var_dump($t->toUpperCase('re4k'));
Output for 8.0.13
Parse error: syntax error, unexpected token "interface" in /in/78v15 on line 3
Process exited with code 255.
Output for 7.3.32 - 7.3.33, 7.4.33
Parse error: syntax error, unexpected 'interface' (T_INTERFACE) in /in/78v15 on line 3
Process exited with code 255.

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