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<?php declare(strict_types=1); error_reporting(-1); ini_set('display_errors', 'On'); class BaseModel { protected static $instances = []; public static function __getInstance(): self { if (!isset(static::$instances[static::class])) { static::$instances[static::class] = new static(); } return static::$instances[static::class]; } } class AModel extends BaseModel { } class BModel extends BaseModel { } echo get_class(AModel::__getInstance()), "\n"; echo get_class(BModel::__getInstance());