Token field json syntax error bootstrap - json

Question

I have around 700 product list in my Databse table.
I am using bootstrap's tokenfield for auotcomplete, i have to use auto complete in search textbox.
I am getting syntax error :
SyntaxError: missing ] after element list
...B','Lino Perros Men's Leather Wallet - Pink','Lenovo A269i','Lenovo S660 - Tita**
in console.
<?php $t = $this->general_model->auto_complete_sug(); ?>
$( document ).ready(function() {
$('#tokenfield-2').tokenfield({
autocomplete: {
source: <?=$t?>,
delay : 100
},
limit: 1,
minLength: 1,
showAutocompleteOnFocus: true
});
});
<input type="text" class="span2" name="search" id="tokenfield-2" placeholder="Search...">
In my model: I have created this functions:
public function auto_complete_sug()
{
$data = $this->auto_complete_token_fun();
$data1 = explode(',', $data);
$data1 = array_unique($data1);
foreach ($data1 as $value1) {
$temparr[] = $value1;
}
$str = '[';
$c = count($temparr);
$counter = 0;
foreach ($temparr as $val) {
$counter++;
$str .= "'".$val."'";
if($counter < $c){
$str .= ",";
}
}
$str .= ']';
return $str;
}
public function auto_complete_token_fun()
{
// $this->db->query("SET GLOBAL group_concat_max_len = 10000000");
$q = $this->db->query("SELECT GROUP_CONCAT( sub_category_name ) AS scname
FROM `tbl_subcategory` WHERE status = 'Active' ");
if($q->num_rows() > 0)
{
$d = $q->row_array();
return $d['scname'];
}
else
{
return '';
}
}
Please help!!