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MongoDB\MapReduceResult::getIterator()

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Definition

MongoDB\MapReduceResult::getIterator

Returns a Traversable, which may be used to iterate through the results of the map-reduce operation.

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function getIterator(): Traversable

Return Values

A Traversable, which may be used to iterate through the results of the map-reduce operation.

Example

This example iterates through the results of 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);

foreach ($result as $population) {
   var_dump($population);
};

The output would then resemble:

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object(stdClass)#2293 (2) {
   ["_id"]=>
   string(2) "AK"
   ["value"]=>
   float(544698)
}
object(stdClass)#2300 (2) {
   ["_id"]=>
   string(2) "AL"
   ["value"]=>
   float(4040587)
}
object(stdClass)#2293 (2) {
   ["_id"]=>
   string(2) "AR"
   ["value"]=>
   float(2350725)
}
object(stdClass)#2300 (2) {
   ["_id"]=>
   string(2) "AZ"
   ["value"]=>
   float(3665228)
}

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