因此，我没有设法用db2扩展连接到我的db2 DB，但我找到了一个替代方法--〉

$database = "xxx";
$hostname = "xxx";
$user     = "xxx";
$password = "xxx";
$port     = 50000;

# Build the connection string

$driver  = "DRIVER={IBM DB2 ODBC DRIVER};";
$dsn     = "DATABASE=$database; " .
           "HOSTNAME=$hostname;" .
           "PORT=$port; " .
           "PROTOCOL=TCPIP; " .
           "UID=$user;" .
           "PWD=$password;";

$conn_string = $driver . $dsn;

# Connect

$conn = odbc_connect( $conn_string, "", "" );
if( $conn )
{
    echo "Connection succeeded.";
    odbc_close( $conn );
}
else
{
    echo "Connection failed.";
}

output --〉连接成功。
源代码--〉https://www.ibm.com/docs/en/db2woc?topic=programmatically-php