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<?php interface Asd { public function qwerty(int $q): array; } class Qwertyasd implements Asd { public function qwerty($q): array { return 123; } }
Output for 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 - 8.3.6
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33
Fatal error: Declaration of Qwertyasd::qwerty($q): array must be compatible with Asd::qwerty(int $q): array in /in/dr7DB on line 8
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/dr7DB on line 5
Process exited with code 255.

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