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PHP Manual
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Weak References
Weak References
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WeakRef
— The WeakRef class
Weakref::acquire
— Acquires a strong reference on that object
Weakref::__construct
— Constructs a new weak reference
Weakref::get
— Returns the object pointed to by the weak reference
Weakref::release
— Releases a previously acquired reference
Weakref::valid
— Checks whether the object referenced still exists
WeakMap
— The WeakMap class
WeakMap::__construct
— Constructs a new map
WeakMap::count
— Counts the number of live entries in the map
WeakMap::current
— Returns the current value under iteration
WeakMap::key
— Returns the current key under iteration
WeakMap::next
— Advances to the next map element
WeakMap::offsetExists
— Checks whether a certain object is in the map
WeakMap::offsetGet
— Returns the value pointed to by a certain object
WeakMap::offsetSet
— Updates the map with a new key-value pair
WeakMap::offsetUnset
— Removes an entry from the map
WeakMap::rewind
— Rewinds the iterator to the beginning of the map
WeakMap::valid
— Returns whether the iterator is still on a valid map element