The QosClass Enum
 
 
  
   简介
   
    The QosClass enum is used to specify the user process
    priority with pcntl_setqos_class().
   
   
  
   注解摘要
   
    
         case  Pcntl::Background
     ;
/** 
      Runs the process after all high-priority ones had ran their courses.
      */
    
    
         case  Pcntl::Default
     ;
/** 
      Runs the process after all high-priority processes but before the low-priority ones.
      */
    
    
         case  Pcntl::UserInteractive
     ;
/** 
      Runs the process as the highest priority level.
      */
    
    
         case  Pcntl::UserInitiated
     ;
/** 
      Runs the process at high priority level but below Pcntl::UserInteractive ones.
      */
    
  }
 
   
  
 
    
官方地址:https://www.php.net/manual/en/enum.qosclass.php