PHP Doctrine\MongoDB\Aggregation Expr::stdDevPop示例

stdDevPop() public method

The arguments can be any expression as long as it resolves to an array.

See also: https://docs.mongodb.org/manual/reference/operator/aggregation/stdDevPop/

Since: 1.3

public stdDevPop ( mixed | self $expression1 )
$expression1	mixed | self

示例#1

文件： Group.php 项目： malukenho/mongodb

 /**
  * Calculates the population standard deviation of the input values.
  *
  * The argument can be any expression as long as it resolves to an array.
  *
  * @see https://docs.mongodb.org/manual/reference/operator/aggregation/stdDevPop/
  * @see Expr::stdDevPop
  * @param mixed|Expr $expression
  * @return self
  *
  * @since 1.3
  */
 public function stdDevPop($expression)
 {
     $this->expr->stdDevPop($expression);
     return $this;
 }