Online PHP editor | output for tobWE

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Fatal error: Uncaught Error: Undefined constant "array_merge" in /in/tobWE:9 Stack trace: #0 {main} thrown in /in/tobWE on line 9
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: Warning: Use of undefined constant array_merge - assumed 'array_merge' (this will throw an Error in a future version of PHP) in /in/tobWE on line 9 array(3) { [0]=> string(4) "year" [1]=> string(5) "month" [2]=> string(4) "hour" }
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25: Notice: Use of undefined constant array_merge - assumed 'array_merge' in /in/tobWE on line 9 array(3) { [0]=> string(4) "year" [1]=> string(5) "month" [2]=> string(4) "hour" }
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/tobWE 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/tobWE on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/tobWE on line 3
Process exited with code 255.