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php提供了兩套函數與Oracle連接，分別是ORA_和OCI函數。其中ORA_函數略顯陳舊。OCI函數更新據說更好一些。兩者的使用語法幾乎相差無幾。如前所述，你的php安裝選項應該可以支持兩者的使用。
想獲得更多有關在Microsoft Windows平臺上安裝支持php3的Apache服務器的知識以及更多有關Oracle數據庫的知識，請查閱以下URL：www.csoft.NET/~vsbabu/articles/oraphp.html。
4.1 連接
if ($conn=Ora_Logon("user@TNSNAME","password"))
{
echo "SUCCESS ! Connected to database/n";
}
else
{
echo "Failed :-( Could not connect to database/n";
}
Ora_Logoff($conn);
phpinfo();
?>
以上代碼使用TNSNAME（在你的tnsnames.ora文件中指明）定義的Oracle數據庫名稱、用戶名稱和密碼連接數據庫。在成功連接的基礎上，ora_logon函數返回一個非零的連接ID并儲存在變量$conn中。
4.2 查詢
假設與數據庫已經連接就緒，下面我們就來實際的應用對數據庫的查詢。下面的代碼演示了一個連接并查詢的典型例子：
/*
* 連接數據庫并執行查詢
*/
function printoraerr($in_cur)
{
// 檢查Oracle是否出錯
// 如果存在錯誤則顯示
// 當指針被激活時每次請求Oracle后調用該函數
if(ora_errorcode($in_cur))
echo "Oracle code - ".ora_error($in_cur)."/n";
return;
}
/** 主程序 */
if (!($conn=ora_logon("user@TNSNAME","password")))
{
echo "Connection to database failed/n";
exit;
}
echo "Connected as connection - $conn
/n";
echo "Opening cursor ...
/n";
$cursor=ora_open($conn); printoraerr($cursor);
echo "Opened cursor - $cursor
/n";
$qry="select user,sysdate from dual";
echo "Parsing the query $qry ...
/n";
ora_parse($cursor,$qry,0); printoraerr($cursor);
echo "Query parsed
/n";
echo "Executing cursor ...
/n";
ora_exec($cursor); printoraerr($cursor);
echo "Executed cursor
/n";
echo "Fetching cursor ...
/n";
while(ora_fetch($cursor))
{
$user=ora_getcolumn($cursor,0); printoraerr($cursor);
$sysdate=ora_getcolumn($cursor,1); printoraerr($cursor);
echo " row = $user, $sysdate
/n";
}
echo "Fetched all records
/n";
echo "Closing cursor ...
/n";
ora_close($cursor);
echo "Closed cursor
/n";
echo "Logging off from oracle...
/n";
ora_logoff($conn);
echo "Logged off from oracle
/n";
?>
（譯者注：以上代碼段缺少注釋，請讀者參考php Manual的Oracle數據庫函數部分）
4.3 顯示結果
以下代碼演示了怎樣查詢數據庫并將結果輸出：
function printoraerr($in_cur, $conn)
{
// 檢查Oracle是否出錯
// 如果存在錯誤則顯示
// 當指針被激活時每次請求Oracle后調用該函數
// If it encountered an error, we exit immediately
if(ora_errorcode($in_cur))
{
echo "Oracle code - ".ora_error($in_cur)."
n";
ora_logoff($conn);
exit;
}
return;
}
function exequery($w_qry,$conn)
{
$cursor=ora_open($conn); printoraerr($cursor,$conn);
ora_parse($cursor,$w_qry,0); printoraerr($cursor,$conn);
ora_exec($cursor); printoraerr($cursor,$conn);
$numrows=0;
$w_numcols=ora_numcols($cursor);
// 顯示頭部
echo "
/n";
for ($i=0;$i<$w_numcols;$i++)
{
$align=(ora_columntype($cursor,$i)=="NUMBER")?"RIGHT":"LEFT";
echo "/t ".ora_columnname($cursor,$i)." /n";
}
echo "
/n";
while(ora_fetch($cursor))
{
echo " /n";
for ($i=0;$i<$w_numcols;$i++)
{
$align=(ora_columntype($cursor,$i)=="NUMBER")?"RIGHT":"LEFT";
if(ora_columntype($cursor,$i)=="LONG")
echo " ".
ora_getcolumn($cursor,$i)."
/n";
else
echo " ".ora_getcolumn($cursor,$i)." /n";
printoraerr($cursor,$conn);
}
$numrows++;
echo "
/n";
}
if ($numrows==0)
echo " Query returned no records
/n";
else
{
echo " /n";
echo " Count /n";
echo " $numrows /n";
echo "
/n";
}
echo " /n";
ora_close($cursor);
return;
}
// 主程序
if(!($conn=ora_logon("user@SID","password")))
{
echo "Error: Cannot connect to database/n";
exit;
}
$qry="SELECT
deptno /"Dept/"
,empno /"Emp/"
,empnm /"Name/"
,salary /"Salary/"
FROM
employee
ORDER BY 1,2";
exequery($qry);
ora_logoff($conn);
?>
（譯者注：以上代碼段缺少注釋，請讀者參考php Manual的Oracle數據庫函數部分）
4.4 基于HTTP的Oracle登錄
將以下代碼加在php頁面代碼之前以確認Oracle登錄。注意你必須正確設定$ SID。
if(!isset($php_AUTH_USER))
{
Header("WWW-authenticate: basic realm=/"$SID/"");
Header("HTTP/1.0 401 Unauthorized");
$title="Login Instructions";
echo "
You are not authorized to enter the site
/n";
exit;
}
else
{
if (!($conn=ora_logon("$php_AUTH_USER@$SID",$php_AUTH_PW)))
{
Header("WWW-authenticate: basic realm=/"$SID/"");
Header("HTTP/1.0 401 Unauthorized");
$title="Login Instructions";
echo "
You are not authorised to enter the site
/n";
exit;
}
}
?>
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