Online PHP editor | output for c7FK6

Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback or null, array callback must have exactly two members in /in/c7FK6:7 Stack trace: #0 /in/c7FK6(7): array_map(Array, Object(Closure)) #1 {main} thrown in /in/c7FK6 on line 7
Process exited with code 255.
Output for 8.1.0 - 8.1.28: Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback or null, array must have exactly two members in /in/c7FK6:7 Stack trace: #0 /in/c7FK6(7): array_map(Array, Object(Closure)) #1 {main} thrown in /in/c7FK6 on line 7
Process exited with code 255.
Output for 8.0.0 - 8.0.30: Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback, array must have exactly two members in /in/c7FK6:7 Stack trace: #0 /in/c7FK6(7): array_map(Array, Object(Closure)) #1 {main} thrown in /in/c7FK6 on line 7
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 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: Warning: array_map() expects parameter 1 to be a valid callback, array must have exactly two members in /in/c7FK6 on line 7 NULL
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/c7FK6 on line 7
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/c7FK6 on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/c7FK6 on line 7
Process exited with code 255.