(PHP 5 >= 5.3.0, PHP 7)
  	
    
      
      Extracts a node from top of the heap and sift up.
    
    
      
      public mixed SplPriorityQueue::extract ( void )
    
    
    
      
      
    
      Returns: 
    The value or priority (or both) of the extracted node, depending on the extract flag.
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