Mastering PHP 7

The object pool pattern

The object pool pattern manages class instances--objects. It is used in situations where we would like to limit unnecessary class instantiation due to resource-intense operations. The object pool acts much like a registry for objects, from which clients can pick up necessary objects later on.

The following example demonstrates a possible object pool pattern implementation:

<?phpclass ObjectPool{    private $instances = [];    public function load($key)    {        return $this->instances[$key];    }    public function save($object, $key)    {        $this->instances[$key] = $object;    }}class User{    public function hello($name)    {        return 'Hello ' . $name;    }}// Client use$pool = new ObjectPool();$user = new User();$key = spl_object_hash($user);$pool ...