class server{
    private $con;
    public static function authenticate($header_params){
        if($header_params->username == 'Aboubakr' && $header_params->password=='root') return true;
        else throw new SOAPFault('wrong user/pass combination', 401);
        }
    public function __construct(){
        $this->con = (is_null($this->con))?self::connect():$this->con;
    }
    static function connect(){
        $con = mysql_connect('localhost','root','nis');
        mysql_select_db('dealer', $con);
        return $con;
        }
    public function getStudentName($id_array){
        $id = $id_array['id'];
        $sql = "SELECT * FROM stockprices WHERE stock_id = '$id'";
        $qry = mysql_query($sql,$this->con);
        $res = mysql_fetch_array($qry);
    return $res['stock_symbol'];
    }
}
$params = array('uri'=>'server.php');
$server = new SoapServer(NULL, $params);
$server->setClass('server');
$server->handle();

<?php
class client{
    public function __construct(){
    $params = array('location'=>'http://localhost/ws/soap/server.php', 'uri'=>'urn://localhost/ws/soap/server.php', 'trace'=>1);
    $this->instance = new SoapClient(NULL, $params);

    //set headers
    $auth_params = new stdClass();
    $auth_params->username = 'Aboubakr';
    $auth_params->password = 'root';

    $header_params = new soapVar($auth_params, SOAP_ENC_OBJECT);
    $header = new soapHeader('codev','authenticate', $header_params, false);
    $this->instance->__setSoapHeaders(array($header));
    }
    public function getName($id_array){
    return $this->instance->__soapCall('getStudentName', $id_array);
    }
}
$client = new client;
?>

<?php
include('client.php');
$id_array = array('id'=>'2');
echo $client->getName($id_array);
?>