Online PHP editor | output for siCGr

Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback or null, array callback must have exactly two members in /in/siCGr:9 Stack trace: #0 /in/siCGr(9): array_map(Array, Array) #1 /in/siCGr(17): Xoo->a() #2 {main} thrown in /in/siCGr on line 9
Process exited with code 255.
Output for 8.1.0 - 8.1.28: Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback or null, array must have exactly two members in /in/siCGr:11 Stack trace: #0 /in/siCGr(11): array_map(Array, Array) #1 /in/siCGr(17): Xoo->a() #2 {main} thrown in /in/siCGr on line 11
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/siCGr:11 Stack trace: #0 /in/siCGr(11): array_map(Array, Array) #1 /in/siCGr(17): Xoo->a() #2 {main} thrown in /in/siCGr on line 11
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: Warning: array_map() expects parameter 1 to be a valid callback, array must have exactly two members in /in/siCGr on line 11 NULL
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28: Warning: array_map() expects parameter 1 to be a valid callback, array must have exactly two members in /in/siCGr on line 12 NULL
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Warning: array_map(): The first argument, 'Array', should be either NULL or a valid callback in /in/siCGr on line 12 NULL
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/siCGr on line 4
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: Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/siCGr on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/siCGr on line 4
Process exited with code 255.