Context parameters
  Context parameters — Context parameter listing
  
 
 
  说明
  
   These parameters can be set on a context
   using the  stream_context_set_params() function.
  
  
 
  参数
  
   
    - 
     
      
notification
      callable
     
      - 
      
       A callable to be called when an event occurs on a stream.
      
      
       See 
       stream_notification_callback for more details.