Online PHP editor | output for JqTN1

Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.19, 8.4.1 - 8.4.5: steel large black orangearray(4) { [0]=> string(5) "steel" [1]=> string(5) "large" [5]=> string(5) "black" [8]=> string(6) "orange" }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38: Parse error: syntax error, unexpected '.' in /in/JqTN1 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/JqTN1 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/JqTN1 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/JqTN1 on line 3
Process exited with code 255.