Online PHP editor | output for WS873

Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Warning: Undefined variable $first in /in/WS873 on line 5 Fatal error: Uncaught TypeError: array_filter(): Argument #1 ($array) must be of type array, null given in /in/WS873:5 Stack trace: #0 /in/WS873(5): array_filter(NULL, Object(Closure)) #1 {main} thrown in /in/WS873 on line 5
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28: Warning: Undefined variable $first in /in/WS873 on line 5 Fatal error: Uncaught TypeError: array_filter(): Argument #1 ($array) must be of type array, null given in /in/WS873:7 Stack trace: #0 /in/WS873(7): array_filter(NULL, Object(Closure)) #1 {main} thrown in /in/WS873 on line 7
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33: Notice: Undefined variable: first in /in/WS873 on line 5 Warning: array_filter() expects parameter 1 to be array, null given in /in/WS873 on line 7 bool(true)
Output for 7.3.32 - 7.3.33: Warning: array_filter() expects parameter 1 to be array, null given in /in/WS873 on line 7 bool(true)
Output for 5.4.0 - 5.4.45: Fatal error: Can't use function return value in write context in /in/WS873 on line 7
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, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/WS873 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 '[' in /in/WS873 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/WS873 on line 3
Process exited with code 255.