PHP/Ajax/Json-来自PHP的JSON回显冻结了脚本? [英] PHP/Ajax/Json - JSON echo from PHP freezes script?

问题描述

我通常通过搜索找到答案，但这使我感到困惑，并且找不到任何相关文章:/

I normally find my answers through searches, but this ones got me stumped and I can't find any related articles :/

我只是运行对我的PHP脚本的AJAX调用，并警告返回的值(JSON编码的对象).

I am simply running an AJAX call to my PHP script and alerting the returned value (JSON encoded object).

问题是，脚本一旦击中我的"echo"语句，便会冻结.我已经在没有回声的情况下进行了测试，甚至没有使用"Hello"(两者都成功)之类的值.我还使用在网上找到的示例JSON字符串测试了输出.这失败了.

The problem is, the script freezes as soon as it hits my 'echo' statement. I have tested without the echo, and even with values such as "Hello" (both which were successful). I also tested an output with an example JSON string that I found online. This failed.

我现在认为，任何构造为JSON的字符串都会导致此错误(我已经在jsonlint.com上测试了这两个JSON脚本).

I am now believing that any string structured as JSON will cause this error (I have tested both JSON scripts on jsonlint.com).

非常感谢所有帮助！

JavaScript代码:

Javascript Code:

function scan()
{
var script          = "../resources/ajax/fincenmanager/load_reports.php";
var params          = "";
var return_function = "load_wire";

document.getElementById("loading_screen").className = "show";

ajax(script, params, return_function);
}
function load_wire(text)
{
document.getElementById("loading_screen").className = "hidden";
alert(text);
}

PHP代码:

<?php
     require_once("../../config.php");
     require_once("../../library/FincenManager/fincenmanagerclass.php");

     header("Content-Type: application/json");

     $manager = new FincenManager("../../inputs/FincenManager/");

     $json = json_encode($manager);

     // Script Breaks After This Line.. 100% Sure :/
     echo $json;
 ?>

推荐答案

嗯，

我正在研究推理，但我相信这应该足以帮助遇到此问题的任何人:

I am looking into reasoning but I believe this should be sufficient to help anyone who runs into this problem:

我的JSON字符串中的双引号(编码对象时json_encode创建的双引号)导致'echo'语句失败.为了解决这个问题，我使用以下命令将所有未转义的双引号替换为转义的双引号:

The double quotes in my JSON string (the double quotes created by json_encode when encoding the object) were causing the 'echo' statement to fail. To resolve this I replaced all unescaped double quotes with escaped double quotes using the following:

str_replace( " \" " , " \\\" " , json_encode($object) )

我相信这是json_encode自身没有转义双引号的结果，并且仅在尝试从ajax请求调用的外部脚本中回显"时发生.

I believe this to be the result of json_encode not escaping the double quotes on its own, and only happens when trying to 'echo' from an external script called from an ajax request.

谢谢大家:D

这篇关于PHP/Ajax/Json-来自PHP的JSON回显冻结了脚本?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！