(PECL weakref >= 0.1.0) Releases a previously acquired reference
(PECL weakref >= 0.1.0) Checks whether the object referenced still exists
(PECL weakref >= 0.2.0) Returns the value pointed to by a certain object
(PECL weakref >= 0.2.0) Advances to the next map element
(PECL weakref >= 0.2.0) Rewinds the iterator to the beginning of the map
(PECL weakref >= 0.1.0) Acquires a strong reference on that object
(PECL weakref >= 0.2.0) Updates the map with a new key-value pair
(PECL weakref >= 0.1.0) Constructs a new weak reference
(PECL weakref >= 0.2.0) Counts the number of live entries in the map
(PECL weakref >= 0.2.0) Returns the current value under iteration
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