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<?php abstract class Figure { protected $color; protected $position; abstract public function move($a, $b); } class Bishop extends Figure { public function move($a, $b) { return true; } } class Rook extends Figure { public function move($a, $b) { return false; } } class Queen extends Figure { public function move($a, $b) { return false; } } $bishop = new Bishop(); assert($bighop->move('E2', 'E4') === false); assert($bighop->move('E2', 'A6') === true);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Undefined variable $bighop in /in/k0ev6 on line 31 Fatal error: Uncaught Error: Call to a member function move() on null in /in/k0ev6:31 Stack trace: #0 {main} thrown in /in/k0ev6 on line 31
Process exited with code 255.
Output for 7.0.5 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: bighop in /in/k0ev6 on line 31 Fatal error: Uncaught Error: Call to a member function move() on null in /in/k0ev6:31 Stack trace: #0 {main} thrown in /in/k0ev6 on line 31
Process exited with code 255.
Output for 7.3.32 - 7.3.33
Fatal error: Uncaught Error: Call to a member function move() on null in /in/k0ev6:31 Stack trace: #0 {main} thrown in /in/k0ev6 on line 31
Process exited with code 255.
Output for 7.0.0 - 7.0.4
Notice: Undefined variable: bighop in /in/k0ev6 on line 31 Fatal error: Uncaught Error: Call to a member function move() on unknown in /in/k0ev6:31 Stack trace: #0 {main} thrown in /in/k0ev6 on line 31
Process exited with code 255.
Output for 5.6.0 - 5.6.38
Notice: Undefined variable: bighop in /in/k0ev6 on line 31 Fatal error: Call to a member function move() on null in /in/k0ev6 on line 31
Process exited with code 255.
Output for 5.5.0 - 5.5.38
Notice: Undefined variable: bighop in /in/k0ev6 on line 31 Fatal error: Call to a member function move() on a non-object in /in/k0ev6 on line 31
Process exited with code 255.

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