(PHP 5 >= 5.3.0, PHP 7)
  	
    
      
      Peeks at the node from the top of the queue
    
    
      
      public mixed SplPriorityQueue::top ( void )
    
    
    
      
      
    
      Returns: 
    The value or priority (or both) of the top node, depending on the extract flag.
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