meta() public method

Returns the metadata associated with a document in a pipeline operations.
See also: http://docs.mongodb.org/manual/reference/operator/aggregation/meta/
public meta ( $metaDataKeyword )
$metaDataKeyword
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 /**
  * Returns the metadata associated with a document in a pipeline operations.
  *
  * @see http://docs.mongodb.org/manual/reference/operator/aggregation/meta/
  * @see Expr::meta
  * @param $metaDataKeyword
  * @return self
  */
 public function meta($metaDataKeyword)
 {
     $this->expr->meta($metaDataKeyword);
     return $this;
 }