WeakMap::current
WeakMap::next
WeakMap
PHP Manual

# WeakMap::key

(PECL weakref >= 0.2.0)

WeakMap::key — Returns the current key under iteration.

### Description

public object WeakMap::key ( void )

Returns the object serving as key in the map, at the current iterating position.

### Parameters

This function has no parameters.

### Return Values

The object key currently being iterated.

WeakMap::current
WeakMap::next
WeakMap
PHP Manual