PHP操作MongoDB时的整数问题及对策


ini_set(mongo.native_long, 1);

$instance = new Mongo();

$instance = $instance->selectCollection(test, test);

for ($i = 0; $i < 10; $i++) {
    $instance->insert(array(
        group_id => rand(1, 5),
        count    => rand(1, 5),
    ));
}

?>


ini_set(mongo.native_long, 1);

$instance = new Mongo();

$instance = $instance->selectCollection(test, test);

$keys = array(group_id => 1);

$initial = array(count => 0);

$reduce =
    function(obj, prev) {
        prev.count += obj.count;
    }
;

$result = $instance->group($keys, $initial, $reduce);

var_dump($result);

?>

ini_set(mongo.native_long, 0);

$initial = array(count => (float)0);


ini_set(mongo.native_long, 1);

$instance = new Mongo();

$instance = $instance->selectDB(test);

$map =
    function() {
        emit(this.group_id, this.count);
    }
;

$reduce =
    function(key, values) {
        var sum = 0;

        for (var index in values) {
            sum += values[index];
        }

        return sum;
    }
;

$result = $instance->command(array(
    mapreduce => test,
    map       => $map,
    reduce    => $reduce
));

$result = iterator_to_array($instance->{$result[result]}->find());

var_dump($result);

?>