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<?php class fakePDO { } class DatabaseConnection { protected $connection; public function __construct() { $connection = new fakePDO(); } public function __destruct() { unset($this->connection); } } class Database { static $connections = array(); public static function open($key) { self::$connections[$key] = new DatabaseConnection(); } public static function close($key) { unset(self::$connections[$key]); gc_collect_cycles(); } } Database::open('a'); Database::open('b'); Database::close('a'); debug_zval_dump(Database::$connections);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) refcount(2){ ["b"]=> object(DatabaseConnection)#2 (1) refcount(1){ ["connection":protected]=> NULL } }

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