Codeigniter get selected values of form_multiselect - php

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');