Sokil\Mongo\Pipeline\GroupStage::sum PHP Method

GroupStage Class Documentation Show file Open project: sokil/php-mongo

sum() public method

Calculates and returns the sum of all the numeric values that result from applying a specified expression to each document in a group of documents that share the same group by key. $sum ignores non-numeric values.

See link: http://docs.mongodb.org/manual/reference/operator/aggregation/sum

public sum ( string $field, literal \| callable \| Sokil\Mongo\Pipeline\Expression $expression ) : GroupStage
$field	string
$expression	literal \| callable \| Sokil\Mongo\Pipeline\Expression	Expression
return	GroupStage

    public function sum($field, $expression)
    {
        $this->stage[$field]['$sum'] = Expression::normalize($expression);
        return $this;
    }

GroupStage

addToSet

avg

first

last

max

min

push

setId

sum

toArray