Online PHP editor | output for 9QXr2

Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /in/9QXr2 on line 9 Fatal error: Uncaught Exception in /in/9QXr2:4 Stack trace: #0 [internal function]: {closure}(2, 'preg_match(): U...', '/in/9QXr2', 9) #1 /in/9QXr2(9): preg_match('```', '') #2 {main} thrown in /in/9QXr2 on line 4
Process exited with code 255.
Output for 8.0.0 - 8.0.30: Fatal error: Uncaught Exception in /in/9QXr2:4 Stack trace: #0 [internal function]: {closure}(2, 'preg_match(): U...', '/in/9QXr2', 9) #1 /in/9QXr2(9): preg_match('```', '') #2 {main} thrown in /in/9QXr2 on line 4
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: Fatal error: Uncaught Exception in /in/9QXr2:4 Stack trace: #0 [internal function]: {closure}(2, 'preg_match(): U...', '/in/9QXr2', 9, Array) #1 /in/9QXr2(9): preg_match('```', '') #2 {main} thrown in /in/9QXr2 on line 4
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: Fatal error: Uncaught exception 'Exception' in /in/9QXr2:4 Stack trace: #0 [internal function]: {closure}(2, 'preg_match(): U...', '/in/9QXr2', 9, Array) #1 /in/9QXr2(9): preg_match('```', '') #2 {main} thrown in /in/9QXr2 on line 4
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: Parse error: syntax error, unexpected T_FUNCTION in /in/9QXr2 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 T_FUNCTION in /in/9QXr2 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/9QXr2 on line 3
Process exited with code 255.