php 连接oracle

$dbconn=oci_connect('tzjh','tzjh',"(DESCRIPTION =  (ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.136.20)(PORT = 1521)))(CONNECT_DATA =(SERVICE_NAME = zjqqcs)))"); 
if($dbconn!=false) 
{} 
else 
{echo "连接失败";}

$sqle = "select  serial_no,init_date,fund_account,contract_code,entrust_bs,futures_direction,futu_business_price,business_amount,business_time,frozen_fare from hs_futures.fureal order by serial_no ASC,init_date ASC,fund_account ASC";
$ora_testr = oci_parse($dbconn,$sqle);  //编译sql语句 
oci_execute($ora_testr,OCI_DEFAULT);  //执行

$h=0;
while($r=oci_fetch_row($ora_testr))  //取回结果 
{
echo $r[0];
}