Online PHP editor | output for b8cdU

Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Fatal error: Uncaught Exception: Cake! in /in/b8cdU:4 Stack trace: #0 [internal function]: {closure}(NULL, 'S') #1 /in/b8cdU(3): array_reduce(Array, Object(Closure)) #2 {main} thrown in /in/b8cdU on line 4
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, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28: Fatal error: Uncaught Exception: Cake! in /in/b8cdU:4 Stack trace: #0 [internal function]: {closure}(NULL, 'S') #1 /in/b8cdU(5): array_reduce(Array, Object(Closure)) #2 {main} thrown in /in/b8cdU on line 4
Process exited with code 255.
Output for 5.3.3 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28: Warning: array_reduce(): An error occurred while invoking the reduction callback in /in/b8cdU on line 5 Fatal error: Uncaught exception 'Exception' with message 'Cake!' in /in/b8cdU:4 Stack trace: #0 [internal function]: {closure}(NULL, 'S') #1 /in/b8cdU(5): array_reduce(Array, Object(Closure)) #2 {main} thrown in /in/b8cdU on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.2: Warning: array_reduce(): An error occurred while invoking the reduction callback in /in/b8cdU on line 0 Fatal error: Uncaught exception 'Exception' with message 'Cake!' in /in/b8cdU:4 Stack trace: #0 [internal function]: {closure}(NULL, 'S') #1 /in/b8cdU(5): array_reduce(Array, Object(Closure)) #2 {main} thrown in /in/b8cdU on line 4
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: Parse error: syntax error, unexpected T_FUNCTION in /in/b8cdU 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_FUNCTION in /in/b8cdU on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/b8cdU on line 3
Process exited with code 255.