Codeigniter获取选定的form_multiselect值

Question

i'm working on a codeigniter website and i need to use form_multiselect the select shows fine but when i post it and i try to get the selected value on the controller when i do :

$category = $this->input->get_post('category'); var_dump($category);

i get string(0) "".

here is my codes :

View

<?php echo form_multiselect('category[]', $categories); ?>

Controller

$data['categories'] = $this->blog_category_model->getblogcatDropDown($app_key);
$category = $this->input->get_post('category'); 
var_dump($category);
die;

Model

public function getblogcatDropDown($app_key)
{
    $query = $this->db->query('SELECT * FROM `webapp_blog_categories` WHERE `app_key`=('.$this->db->escape($app_key).') ORDER BY `id` ASC')->result();
    $return[''] = 'Choose blog category';
    foreach ($query as $row) {
        $return[$row->id] = $row->cat_name;
    }

    return $return;
}

update

when i use html select on the view :

<select multiple name="tst[]">
     <option value="" disabled selected>Choose your option</option>
     <option value="1">Option 1</option>
     <option value="2">Option 2</option>
     <option value="3">Option 3</option>
</select>

it works fine , but the generated form not working

can any one help me ? thanks

Answer 1

Make sure the form method="post" and simply check the whether the value is posted when you submit the form using developer tools.

for getting the value in controller. it's simply.

$category = $this->input->post('category');