stats_absolute_deviation
(PECL stats >= 1.0.0)
stats_absolute_deviation — Returns the absolute deviation of an array of values
说明
   stats_absolute_deviation
    ( array 
  $a
   ) : float
   Returns the absolute deviation of the values in a.
  
参数
- 
a
- 
      The input array 
返回值
   Returns the absolute deviation of the values in a,
   or FALSE if a is empty or is not an array.