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• MongoDB\MapReduceResult::getCounts()

MongoDB\MapReduceResult::getCounts()

Definition

MongoDB\MapReduceResult::getCounts

Returns count statistics for the map-reduce operation.

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function getCounts(): array

Return Values

An array of count statistics for the map-reduce operation.

Examples

This example reports the count statistics for a map-reduce operation.

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<?php

$collection = (new MongoDB\Client)->test->zips;

$map = new MongoDB\BSON\Javascript('function() { emit(this.state, this.pop); }');
$reduce = new MongoDB\BSON\Javascript('function(key, values) { return Array.sum(values) }');
$out = ['inline' => 1];

$result = $collection->mapReduce($map, $reduce, $out);

var_dump($result->getCounts());

The output would then resemble:

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array(4) {
  ["input"]=>
  int(29353)
  ["emit"]=>
  int(29353)
  ["reduce"]=>
  int(180)
  ["output"]=>
  int(51)
}

See Also

• MongoDB\Collection::mapReduce()
• mapReduce command reference in the MongoDB manual

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