Online PHP editor | output for re6TF

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 - 5.2.17, 5.3.0 - 5.3.29, 7.2.29 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.32, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: <? $r = $mysqli->query("SELECT group_concat(table_schema,table_name,0x0a) FROM information_schema.tables"); while($w=$mysqli->fetch_row($r)) echo htmlentities($w[0]); ?>
Output for 8.0.13: Warning: Undefined variable $mysqli in /in/re6TF on line 1 Fatal error: Uncaught Error: Call to a member function query() on null in /in/re6TF:1 Stack trace: #0 {main} thrown in /in/re6TF on line 1
Process exited with code 255.
Output for 7.0.5 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.6, 7.4.33: Notice: Undefined variable: mysqli in /in/re6TF on line 1 Fatal error: Uncaught Error: Call to a member function query() on null in /in/re6TF:1 Stack trace: #0 {main} thrown in /in/re6TF on line 1
Process exited with code 255.
Output for 7.3.32 - 7.3.33, 7.4.26: Fatal error: Uncaught Error: Call to a member function query() on null in /in/re6TF:1 Stack trace: #0 {main} thrown in /in/re6TF on line 1
Process exited with code 255.
Output for 7.0.0 - 7.0.4: Notice: Undefined variable: mysqli in /in/re6TF on line 1 Fatal error: Uncaught Error: Call to a member function query() on unknown in /in/re6TF:1 Stack trace: #0 {main} thrown in /in/re6TF on line 1
Process exited with code 255.
Output for 5.6.0 - 5.6.28: Notice: Undefined variable: mysqli in /in/re6TF on line 1 Fatal error: Call to a member function query() on null in /in/re6TF on line 1
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38: Notice: Undefined variable: mysqli in /in/re6TF on line 1 Fatal error: Call to a member function query() on a non-object in /in/re6TF on line 1
Process exited with code 255.