为什么json_encode返回数组而不是对象？

Question

如果你想否决这个问题，请说明原因，这样我就可以从我的错误中吸取教训。

PHP -编辑

<?php

require_once "dbconnect.php";

function isEmpty($str) {
    return strlen(trim($str)) == 0;
}

function getWritersData() {
    try {
        if (!isset($_REQUEST["userid"]) || isEmpty($_REQUEST["userid"])) {
            throw new Exception('A user-id must be supplied.');       
        }
        $userid = $_REQUEST["userid"];
        $dbh = connect2DB();
        $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        $stmt = $dbh->prepare("SELECT Title, WorkType, FormType, Genre, NumberOfPages, Filename, OriginalFilename FROM Writers WHERE fkAccounts = :userid");
        $stmt->bindParam(':userid', $userid, PDO::PARAM_INT);
        $stmt->execute();
        $rows = $stmt->fetchAll();
        echo json_encode($rows, JSON_FORCE_OBJECT);
    } catch (PDOException $e) {
        echo 'Database error: ' . $e->getMessage();
    } catch (Exception $e) {
        echo 'General error: ' . $e->getMessage();
    }
}    
/** Update writers data **/
function saveWritersData() 
{
    try {
        include_once "commonWritersPostElements";
        $dbh = connect2DB();
        $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        $stmt = $dbh->prepare("UPDATE Writers SET fkAccounts=:userid, Title=:title, WorkType=:worktype, FormType=:formtype, Genre=:genre, NumberOfPages=:pages, Filename=:filename, OriginalFilename=:origonal WHERE fkAccounts=:userid");
        $worktype = "1";            
        $stmt->bindParam(':userid', $userid, PDO::PARAM_INT, 10);
        $stmt->bindParam(':title', $title, PDO::PARAM_STR, 255);
        $stmt->bindParam(':worktype', $worktype, PDO::PARAM_STR, 30);
        $stmt->bindParam(':formtype', $formtype, PDO::PARAM_STR, 30);
        $stmt->bindParam(':genre', $genre, PDO::PARAM_STR, 100);
        $stmt->bindParam(':pages', $nbrPages, PDO::PARAM_STR, 100);
        $stmt->bindParam(':filename', $NewFileName, PDO::PARAM_STR, 30);
        $stmt->bindParam(':original', $File_Name, PDO::PARAM_STR, 30);        
        $stmt->execute();

    } catch (PDOException $e) {
        echo 'Database error: ' . $e->getMessage();
    } catch (Exception $e) {
        echo 'General error: ' . $e->getMessage();
    }
}    
function deleteWritersData() 
{
    try {
        if (!isset($_REQUEST["userid"]) || isEmpty($_REQUEST["userid"]))
            throw new Exception('user-id is missing.');       
        else {
            $userid = filter_var(trim($_REQUEST["user-id"]), FILTER_SANITIZE_STRING);
            $userid = htmlspecialchars_decode($userid, ENT_QUOTES);
        }
        $dbh = connect2DB();
        $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        $stmt = $dbh->prepare("DELETE Writers WHERE fkAccounts=:userid");
        $stmt->bindParam(':userid', $userid, PDO::PARAM_INT, 10);
        $stmt->execute();

    } catch (PDOException $e) {
        echo 'Database error: ' . $e->getMessage();
    } catch (Exception $e) {
        echo 'General error: ' . $e->getMessage();
    }
}    


if (!isset($_REQUEST['action'])  || isEmpty($_REQUEST['action']))
    throw new Exception('Programmer error: action not posted.');
else {
    $action = $_REQUEST['action'];
    switch($action) {
    case 'get-writer-data':
        getWritersData();
        break;
    case 'update-writers':
        select();
        break;
    default:
        throw new Exception("Unknown action: " . $action);
        break;
    }
}

if (!isset($_REQUEST['action'])  || isEmpty($_REQUEST['action']))
    throw new Exception('Programmer error: action not posted.');
else {
    $action = $_REQUEST['action'];
    switch($action) {
    case 'get-writer-data':
        getWritersData();
        break;
    case 'delete-writers':
        deleteWritersData();
        break;
    case 'update-writers':
        saveWritersData();
        break;
    default:
        throw new Exception("Unknown action: " . $action);
        break;
    }
}

?>

JS

$(function () {
    populateWritersDropdowns();

    data = {};
    data.action = 'get-writer-data';
    data.userid = sessionStorage.getItem("user-id");
    console.log("user-id-manage-uploads=" + sessionStorage.getItem("user-id"))
    ajax('post', 'php/manage-uploads.php', data, getSuccess, "Error retrieving writer's data: ");
    $(".tr-clone");
    function getSuccess(data) {
        console.log("data=" + data);
        var trClone = $(".tr-clone");
        var jsonData = $.parseJSON(data);
        var count = 0;
        for (var key in jsonData) count++
        $.each(jsonData, function (key, value) {
            trClone.find(".title").val(value.Title);
            trClone.find(".work-type").val(value.WorkType);
            trClone.find(".form-type").val(value.FormType);
            trClone.find(".genre").val(value.Genre);
            console.log("value.FormType=" + value.FormType + ", form-type.val()=" + trClone.find(".form-type").val());
            console.log("value.Genre=" + value.Genre + ", genre.val()=" + trClone.find(".genre").val());
            trClone.find(".form-type").val(value.FormType);
            trClone.find(".nbr-pages").val(value.NumberOfPages);
            trClone.find(".synopsis a[href='" + value.Filename + "']");
            if (key === count - 1) return false;
            trClone = trClone.clone().insertAfter($(".tr-clone:last"));
        });
    }

console.log

在JS代码中，JSON.parse(.)抛出下面的错误显示。

"OriginalFilename":"MozartWunderkindQueryLetter.pd"，{“标题”：“莫扎特，神童”，“0”：“莫扎特，神童”，"WorkType":"1"，"1":"1"，“1”，“1”，“4”，“4”，“4”，“流派”：“12”，"3":"12"，"NumberOfPages":"250"，"4":"250"，“文件名”：“6532744220.pdf”，"5":"6532744220.pdf"，“OriginalFilename”：“MozartWunderkindQueryLetter.pd”，"6":"MozartWunderkindQueryLetter.pd"}，{“标题”：“莫扎特，魔幻查询-字母”，“0”：“莫扎特，魔幻查询-字母”，"WorkType":"2"，"1":"2"，"FormType":"7"，“2”，“体裁”：“9”，"3":"9"，"NumberOfPages":"129"，"4":"129"，"Filename":"9981287843.pdf"，"5":"9981287843.pdf"，"OriginalFilename":"MozartWunderkindQueryLetter.pd"，"6":"MozartWunderkindQueryLetter.pd"} SyntaxError: Uncaught 613n.parseJSON @ jquery.min.js:4getSuccess @13 1137:13(匿名函数)@13 1136:97j@ jquery.min.js:2x @ jquery.min.js:4 (匿名函数)@jquery.min.js:4

Answer 1

在这里仔细观察您的JSON字符串，我知道您正在重复该字符串两次.以便将它发送给客户端两次，这就是为什么它没有以正确的方式显示.

您可以使用JSON解析器联机工具来了解您的JSON字符串.所以你需要在你的php代码中找出为什么它被发送了两次，它肯定是你已经重复了两次.如果你把你的全部php代码，那么我们可以帮助你更多..

因此，您需要更正来自服务器的响应，因为JSON编码工作正常，编码的字符串应该只响应一次

宾果！在您的php代码中，如果(！isset($_request‘’action‘)\x\isEmpty($_REQUEST’‘action’))，请参见下面这是为什么它要两次回显.并破坏JSON字符串

if (!isset($_REQUEST['action'])  || isEmpty($_REQUEST['action']))
    throw new Exception('Programmer error: action not posted.');
else {
    $action = $_REQUEST['action'];
    switch($action) {
    case 'get-writer-data':
        getWritersData();
        break;
    case 'update-writers':
        select();
        break;
    default:
        throw new Exception("Unknown action: " . $action);
        break;
    }
}

if (!isset($_REQUEST['action'])  || isEmpty($_REQUEST['action']))
    throw new Exception('Programmer error: action not posted.');
else {
    $action = $_REQUEST['action'];
    switch($action) {
    case 'get-writer-data':
        getWritersData();
        break;
    case 'delete-writers':
        deleteWritersData();
        break;
    case 'update-writers':
        saveWritersData();
        break;
    default:
        throw new Exception("Unknown action: " . $action);
        break;
    }
}