PHP驱动MongoDB整数问题的BUG和策略

<?php

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),
    ));
}

?>

<?php

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);