PHP 5.6.x失去了连接ODBC源的能力

Question

I have a strange problem. My server has been running PHP 5.6 for years no problem. (WinServer Std 2K8 SP2, IIS 6, MySQL 5.6 {separate server}, PHP 5.6)

We connect it to a DB2 server at our parent company. Today (2017-02-14) the ODBC connection (PDO_ODBC) started returning "could not find driver".

Excel is able to use the same ODBC connection to query the database - the ODBC connection is working.

I tried using both the PDO method and procedural method to connect. Failures in seeing the driver both ways.

From phpinfo(): ODBC Data PDO Data

Code snippet:

$dsn = "odbc:workingODBCdsn";
$user = "xxxx";
$password = "yyyy";
$conn = null;
$results = array();

try {
    $conn = new PDO($dsn, $user, $password);
} catch (PDOException $e) {
    die($e->getMessage());
}

if ($conn) {
    $qry = $conn->query($sql);
    if ($qry) {
        $qry->setFetchMode(PDO::FETCH_ASSOC); 
        foreach ($qry as $row) {
            $results[] = $row;
        }
    }
}

print "<pre>" . print_r($results, true) . "</pre>";

//ALT Method
$conn = odbc_connect($dsn, $user, $password);
$results = odbc_exec($conn, $sql);

print "<pre>" . print_r($results, true) . "</pre>";

Thanks in advance for any help.

Answer 1

Server's PHP instance switched from IIS to IISExpress. Switching it back to (full) IIS, and enduring all appropriate PDO drivers were enabled fixed the problem.