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<?php abstract class Foo { private static $instances = array(); private function __construct() { } public static function getInstance() { return isset(static::$instances[$className = get_called_class()]) ? static::$instances[$className] : static::$instances[$className] = new static(); } } 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 Baz
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.5 - 7.2.33, 7.3.12 - 7.3.33
Fatal error: Uncaught Error: Cannot access property Bar::$instances in /in/scXLD:8 Stack trace: #0 /in/scXLD(18): Foo::getInstance() #1 {main} thrown in /in/scXLD on line 8
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 5.6.28
Fatal error: Cannot access property Bar::$instances in /in/scXLD 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, expecting T_STRING or T_VARIABLE or '$' in /in/scXLD on line 8
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STATIC, expecting T_STRING or T_VARIABLE or '$' in /in/scXLD 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/scXLD 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/scXLD on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/scXLD on line 3
Process exited with code 255.
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