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<?php abstract class Foo { private static $instance = NULL; private function __construct() { } public static function getInstance() { return static::$instance === NULL ? static::$instance = new static() : static::$instance; } } final class Bar extends Foo { } final class Baz extends Foo { } $bar = Bar::getInstance(); echo get_class($bar), "\n"; $baz = Baz::getInstance(); echo get_class($baz), "\n";
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Bar Bar
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Fatal error: Uncaught Error: Cannot access property Bar::$instance in /in/9oc9X:8 Stack trace: #0 /in/9oc9X(18): Foo::getInstance() #1 {main} thrown in /in/9oc9X on line 8
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Fatal error: Cannot access property Bar::$instance in /in/9oc9X on line 8
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_STATIC in /in/9oc9X on line 8
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STATIC in /in/9oc9X on line 8
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CLASS in /in/9oc9X 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
Parse error: parse error, unexpected T_CLASS in /in/9oc9X on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/9oc9X on line 3
Process exited with code 255.
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