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<?php error_reporting(-1); function check(): int{ return null; } check();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: check(): Return value must be of type int, null returned in /in/VJTgV:5 Stack trace: #0 /in/VJTgV(7): check() #1 {main} thrown in /in/VJTgV on line 5
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Return value of check() must be of the type int, null returned in /in/VJTgV:5 Stack trace: #0 /in/VJTgV(7): check() #1 {main} thrown in /in/VJTgV on line 5
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
Fatal error: Uncaught TypeError: Return value of check() must be of the type integer, null returned in /in/VJTgV:5 Stack trace: #0 /in/VJTgV(7): check() #1 {main} thrown in /in/VJTgV on line 5
Process exited with code 255.
Output for 5.4.1 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected ':', expecting '{' in /in/VJTgV on line 4
Process exited with code 255.

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