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<?php abstract class Foo { protected static $instances = array(); private function __construct() { } public static function getInstance() { return isset(self::$instances[$className = get_called_class()]) ? self::$instances[$className] : self::$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 git.master, git.master_jit, rfc.property-hooks
Bar Baz

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