ORA-12705:无法访问NLS数据文件或指定的无效环境(extpdo_ocioci_driver.c:686 - ORA-12705: Cannot access NLS data files or invalid environment specified (extpdo_ocioci_driver.c:686)

ORA-12705: Cannot access NLS data files or invalid environment specified (extpdo_ocioci_driver.c:686)

我安装了Apache和PHP，当我尝试通过PDO连接时，我收到了以下消息我使用的是oracle10g企业管理。

OCISessionBegin: ORA-12705: Cannot access NLS data files or invalid environment specified  (ext'pdo_oci'oci_driver.c:686)

这就是我试图使oracle连接的方式

$tns = "
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = COD3R-PC)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = opera)
    )
  )
       ";
try {
    $conn = new PDO("oci:dbname=".$tns, 'customsearch', 'babaji');
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e) {
    echo 'ERROR: ' . $e->getMessage();
}

putenv("NLS_LANG=.WE8ISO8859P1");
$tns = "
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = COD3R-PC)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SID = I_DONT_KNOW_YOUR_SID)
      (SERVER = DEDICATED)
    )
  )
       ";
try {
    $conn = new PDO("oci:dbname=".$tns, 'customsearch', 'babaji');
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e) {
    echo 'ERROR: ' . $e->getMessage();

}