使用foreach插入值JSON？

I want insert this value JSON to database, but with following PHP code it insert just [ in table. how can fix this problem?

Html code:

<input name="start_date[]" value="2012/08/07">
<input name="start_date[]" value="2011/10/29">
<input name="percent[]" value="56">

This value JSON: ["2012\/08\/07","2011\/10\/29"]

PHP code:

    $start_date         = json_encode($this->input->post('start_date'));
    $percent       = $this->input->post('percent');

            print_r($start_date); // This output is as: ["2012\/08\/07","2011\/10\/29"]

            $data = array();
            foreach ($percent as $idx => $name) {
                $data[] = array(
                    'start_date' => $start_date[$idx],
                    'price_change' => $percent[$idx]
                );
            };                
            $this->db->insert_batch('table', $data);

Actually I don't understand what you trying to achieve but I give it a go. Does this help if you just remove "[$idx]" from your $start_date. So record to database would look like:

$data[] = array(
    'start_date' => $start_date,
    'price_change' => $percent[$idx]
);

The " may be confusing it. I can't tell what kind of database system you're using, but maybe you should try escaping the " to \" (with the help of addslashes()) and see if that fixes anything.