Online PHP editor | output for 1Imu2

Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.32, 8.2.0 - 8.2.28, 8.3.0 - 8.3.20, 8.4.1 - 8.4.6: Fatal error: Uncaught Error: Attempt to assign property "length" on null in /in/1Imu2:31 Stack trace: #0 {main} thrown in /in/1Imu2 on line 31
Process exited with code 255.
Output for 7.4.0 - 7.4.33: Warning: Creating default object from empty value in /in/1Imu2 on line 31 Warning: Creating default object from empty value in /in/1Imu2 on line 31 Warning: Creating default object from empty value in /in/1Imu2 on line 31 array(3) { [0]=> object(stdClass)#3 (4) { ["length"]=> int(42) ["height"]=> int(42) ["width"]=> int(42) ["weight"]=> int(42) } [1]=> object(stdClass)#4 (4) { ["length"]=> int(42) ["height"]=> int(42) ["width"]=> int(42) ["weight"]=> int(42) } [2]=> object(stdClass)#5 (4) { ["length"]=> int(69) ["height"]=> int(69) ["width"]=> int(69) ["weight"]=> int(69) } }