WeakRef

( excerpt from http://php.net/manual/en/class.weakref.php )

The WeakRef class provides a gateway to objects without preventing the garbage collector from freeing those objects. It also provides a way to turn a weak reference into a strong one.

Interface Synopsis

final class WeakRef {...}

Public Methods

• ->__construct(?T $reference)
  ( excerpt from http://php.net/manual/en/weakref.construct.php )
• ->acquire(): bool
  ( excerpt from http://php.net/manual/en/weakref.acquire.php )
• ->get(): ?T
  ( excerpt from http://php.net/manual/en/weakref.get.php )
• ->release(): bool
  ( excerpt from http://php.net/manual/en/weakref.release.php )
• ->valid(): bool
  ( excerpt from http://php.net/manual/en/weakref.valid.php )