Quick Search by ID , Name , Phone Create API or Web Service

public function patient_details_search()
		{
			
			 $patient_id=$_POST['patient_id']='1';
			 $first_name=$_POST['first_name']="parimal";
			 $phone=$_POST['phone']='9527070792';
			 
			$query = $this->db->query("SELECT * from tbl_patient_details where id ='".$patient_id."' or first_name ='".$first_name."' or phone ='".$phone."' and is_deleted='N'");
		//echo $this->db->last_query();
		
		if($query->num_rows()>0)
			{
			//echo "Pass";
			echo json_encode($query->result());
			}
			else
			{
				echo "fail";
			}
			
		}