如何在不聲明每個(gè)列名的情況下回顯查詢結(jié)果中的所有行（作為 JSON）？即沒(méi)有寫(xiě)作'location_id' => $row['location_id']等等，就像我在下面所做的那樣。<?phprequire_once("./config.php"); //database configuration filerequire_once("./database.php");//database class file$location_id = isset($_GET["location_id"]) ? $_GET["location_id"] : '';$db = new Database();if (isset($_GET["location_id"])){    $sql = "SELECT * FROM location WHERE location_id = $location_id";} else {    $sql = "SELECT * FROM location";}$results = $db->conn->query($sql);if($results->num_rows > 0){    $data = array();    while($row = $results->fetch_assoc()) {        $data[] = array(        'location_id' => $row['location_id'],        'customer_id' => $row['customer_id'],        'location_id' => $row['location_id'],        'location_name' => $row['location_name'],        'payment_interval' => $row['payment_interval'],        'location_length' => $row['location_length'],        'location_start_date' => $row['location_start_date'],        'location_end_date' => $row['location_end_date'],        'location_status' => $row['location_status'],        'sign_sides' => $row['sign_sides'],        'variable_annual_price' => $row['variable_annual_price'],        'fixed_annual_price' => $row['fixed_annual_price'],        'location_file' => $row['location_file']);    }header("Content-Type: application/json; charset=UTF-8");echo json_encode(array('success' => 1, 'result' => $data));} else {    echo "Records not found.";}?>更新代碼。現(xiàn)在使用@Dharman 推薦的參數(shù)化準(zhǔn)備語(yǔ)句（謝謝?。?。我Parse error: syntax error, unexpected '->' (T_OBJECT_OPERATOR)在第 17 行。我正在運(yùn)行 PHP 7.3 版。怎么了？我應(yīng)該如何回顯 $data 以便它像以前一樣是 JSON 對(duì)象？<?phpheader("Content-Type: application/json; charset=UTF-8");//include required files in the scriptrequire_once("./config.php"); //database configuration filerequire_once("./database.php");//database class file$object_contract_id = isset($_POST["object_contract_id"]) ? $_POST["object_contract_id"] : '';//create the database connection$db = new Database();