ReflectionParameter::canBePassedByValue
  (PHP 5 >= 5.4.0, PHP 7, PHP 8)
ReflectionParameter::canBePassedByValue — Returns whether this parameter can be passed by value
  
 
  说明
  
   public ReflectionParameter::canBePassedByValue(): 
bool 
  
 
 
  返回值
  
   Returns true if the parameter can be passed by value, false otherwise.
   Returns null in case of an error.