Update if data exits otherwise insert new data

I am new in laravel.I want insert data from array into database. My data is inserted into database but when data exits in database, same data uploads into database. I want to insert only new data that is not in database

    $str=$this->entry();
    $end=$this->exit_entry();

    $st=array_chunk($str,5);
    $ex=array_chunk($end,5);
    $result=array();
    foreach($st as $v1){
        $tmp = array(
            'Employee_id'=>$v1[0],
            'Employee_name'=>$v1[1],
            'Date' => $v1[2],
            'Day' =>$v1[3],
            'Time1' => $v1[4]
        );

        foreach($ex as $v2){
            if($v2[1] == $v1[1] && $v2[0] == $v1[0] && $v2[2] == $v1[2] && $v2[3] == $v1[3]  ){
                $tmp['Time2']=$v2[4];
            }
        }
        $result[] =   $tmp;
    }

      foreach($result as $res) {


            $res1 = EmployeeList::insert($res);

    }

    //var_dump($res1);

via Chebli Mohamed