Online PHP editor | output for JT6bD

Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Warning: Undefined variable $arr in /in/JT6bD on line 1 Fatal error: Uncaught TypeError: array_reduce(): Argument #1 ($array) must be of type array, null given in /in/JT6bD:1 Stack trace: #0 /in/JT6bD(1): array_reduce(NULL, Object(Closure), Array) #1 {main} thrown in /in/JT6bD on line 1
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28: Warning: Undefined variable $arr in /in/JT6bD on line 1 Fatal error: Uncaught TypeError: array_reduce(): Argument #1 ($array) must be of type array, null given in /in/JT6bD:4 Stack trace: #0 /in/JT6bD(4): array_reduce(NULL, Object(Closure), Array) #1 {main} thrown in /in/JT6bD on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33: Notice: Undefined variable: arr in /in/JT6bD on line 1 Warning: array_reduce() expects parameter 1 to be array, null given in /in/JT6bD on line 4
Output for 7.3.32 - 7.3.33, 7.4.26: Warning: array_reduce() expects parameter 1 to be array, null given in /in/JT6bD on line 4
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/JT6bD on line 1
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/JT6bD on line 1
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/JT6bD on line 1
Process exited with code 255.