ReflectionParameter::isCallable
  Returns whether parameter MUST be callable
  
 
  Description
  
   public bool ReflectionParameter::isCallable
    ( void
   )
  
  WarningThis function is
currently not documented; only its argument list is available.
 
  
 
  Parameters
  This function has no parameters.
  
 
  Return Values
  
   Returns TRUE if the parameter is callable, FALSE if it is
   not or NULL on failure.