Online PHP editor | output for G6QDr

Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7: Warning: Undefined array key 1 in /in/G6QDr on line 5 Deprecated: checkdnsrr(): Passing null to parameter #1 ($hostname) of type string is deprecated in /in/G6QDr on line 5 Fatal error: Uncaught ValueError: checkdnsrr(): Argument #1 ($hostname) cannot be empty in /in/G6QDr:5 Stack trace: #0 /in/G6QDr(5): checkdnsrr('', 'ANY') #1 {main} thrown in /in/G6QDr on line 5
Process exited with code 255.
Output for 8.0.0 - 8.0.30: Warning: Undefined array key 1 in /in/G6QDr on line 5 Fatal error: Uncaught ValueError: checkdnsrr(): Argument #1 ($hostname) cannot be empty in /in/G6QDr:5 Stack trace: #0 /in/G6QDr(5): checkdnsrr('', 'ANY') #1 {main} thrown in /in/G6QDr on line 5
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33: Notice: Undefined offset: 1 in /in/G6QDr on line 5 Warning: checkdnsrr(): Host cannot be empty in /in/G6QDr on line 5 Notice: Undefined offset: 1 in /in/G6QDr on line 8 Cannot locate MX record for !
Output for 7.3.32 - 7.3.33: Warning: checkdnsrr(): Host cannot be empty in /in/G6QDr on line 5 Cannot locate MX record for !
Output for 5.2.3 - 5.2.17: Notice: Undefined offset: 1 in /in/G6QDr on line 5 Warning: checkdnsrr(): Host and type cannot be empty in /in/G6QDr on line 5 Notice: Undefined offset: 1 in /in/G6QDr on line 8 Cannot locate MX record for !
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.2: Notice: Undefined offset: 1 in /in/G6QDr on line 5 Notice: Undefined index: 1 in /in/G6QDr on line 8 Cannot locate MX record for !