Array to string conversion on CodeIgniter - php

Question

my problem is a want to insert multiple check box on my web application.
error Message
Array to string conversion
please help....
Controller :
public function add_overview_product($type)
{
if ($this->input->post('submit')) {
$type = $type;
$id_overview = $this->input->post('id_overview');
$records = array();
for ($i=0; $i < count($id_overview) ; $i++) {
$records[] = array(
'type' => $type,
'id_overview' => $id_overview[$i]
);
}
$check_idoverview = $this->Biostar->check_idoverview($type,$id_overview);
if ($check_idoverview > 0) {
$message = 'Sorry, The Product can not input twice with the same "TYPE" ';
} else {
foreach ($records as $key => $value) {
$datafield = array(
'type' => $type,
'id_overview' => $id_overview
);
$this->Biostar->saveoverviewproduct($datafield);
}
$data['type'] = $type;
$data['content'] = 'biostar/add_specification';
$this->load->view('dashboard/index', $data);
}
}
$data['diy'] = $diy;
$data['content'] = 'biostar/add_overview_product';
$this->load->view('dashboard/index', $data);
}
My : Model
public function saveoverviewproduct($datafield){
$sql = $this->db->insert('overview_biostar',$datafield);
return $sql;
}
public function check_idoverview($type,$id_overview){
$this->db->select('type');
$this->db->where('type',$type);
$this->db->where('id_overview',$id_overview);
$query = $this->db->get('overview_biostar')->rows();
return $query;
}
View:
<form method="post"action="<?php echo base_url(); ?>biostar/add_overview_product/<?php echo $type; ?>" >
<div class="box-body">
<?php foreach ($audio as $row){ ?>
<div class="checkbox">
<label>
<input type="checkbox" name="id_overview[]" value="<?php echo $row['title']; ?>"><?php echo $row['title']; ?>
</label>
</div>
<?php } ?>
</div>

Answer 1

$check_idoverview = $this->Biostar->check_idoverview($type,$id_overview);
$id_overview is an array. It should be a string.