Online PHP editor | output for QIQPO

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7: Fatal error: Uncaught TypeError: array_merge(): Argument #1 must be of type array, null given in /in/QIQPO:6 Stack trace: #0 /in/QIQPO(6): array_merge(NULL, Array) #1 [internal function]: merge(NULL, Array) #2 /in/QIQPO(8): array_reduce(Array, 'merge') #3 {main} thrown in /in/QIQPO on line 6
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: Warning: array_merge(): Expected parameter 1 to be an array, null given in /in/QIQPO on line 6 Warning: array_merge(): Expected parameter 1 to be an array, null given in /in/QIQPO on line 6 Warning: array_merge(): Expected parameter 1 to be an array, null given in /in/QIQPO on line 6 NULL
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33: Warning: array_merge(): Argument #1 is not an array in /in/QIQPO on line 6 Warning: array_merge(): Argument #1 is not an array in /in/QIQPO on line 6 Warning: array_merge(): Argument #1 is not an array in /in/QIQPO on line 6 NULL
Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9: array(9) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) [6]=> int(7) [7]=> int(8) [8]=> int(9) }
Output for 4.3.0 - 4.3.2: array(7) { ["item_data"]=> array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) } [0]=> int(4) [1]=> int(5) [2]=> int(6) [3]=> int(7) [4]=> int(8) [5]=> int(9) }