$dbuser = "[database username]";
$dbpass = "[database password]";
$db = "SSID";
$connect = oci_connect($dbuser, $dbpass, $db);

if (!$connect) {
    echo "An error occurred connecting to the database";
    exit;
}

$sqlTwo = "SELECT [condition] FROM [database table] WHERE [database row] = '[variable]'";
$stmtTwo = oci_parse($connect, $sqlTwo);
oci_execute($stmtTwo);

if(oci_fetch_array($stmtTwo)) { ... }