| public group ( mixed $keys, array $initial, MongoCode | string $reduce, array $condition = [] ) : array | ||
| $keys | mixed | Fields to group by. If an array or non-code object is passed, it will be the key used to group results. |
| $initial | array | Initial value of the aggregation counter object. |
| $reduce | MongoCode | string | A function that aggregates (reduces) the objects iterated. |
| $condition | array | An condition that must be true for a row to be considered. |
| return | array | |
public function group($keys, array $initial, $reduce, array $condition = [])
{
if (is_string($reduce)) {
$reduce = new MongoCode($reduce);
}
$command = ['group' => ['ns' => $this->name, '$reduce' => (string) $reduce, 'initial' => $initial, 'cond' => $condition]];
if ($keys instanceof MongoCode) {
$command['group']['$keyf'] = (string) $keys;
} else {
$command['group']['key'] = $keys;
}
if (array_key_exists('condition', $condition)) {
$command['group']['cond'] = $condition['condition'];
}
if (array_key_exists('finalize', $condition)) {
if ($condition['finalize'] instanceof MongoCode) {
$condition['finalize'] = (string) $condition['finalize'];
}
$command['group']['finalize'] = $condition['finalize'];
}
return $this->db->command($command);
} public function testGroup2()
{
$this->object->save(array("a" => 2));
$this->object->save(array("b" => 5));
$this->object->save(array("a" => 1));
$keys = array();
$initial = array("count" => 0);
$reduce = "function (obj, prev) { prev.count++; }";
$g = $this->object->group($keys, $initial, $reduce);
$this->assertEquals(3, $g['count']);
}