string to json object in php code example
Example 1: php json_decode
$personJSON = '{"name":"Johny Carson","title":"CTO"}';
$person = json_decode($personJSON);
echo $person->name; // Johny Carson
Example 2: return json in php
//code igniter
$query="qry";
$query = $this->db->query($query);
$res=$query->result();
return json_encode($res);