Php 无法解码json变量

下面是生成JSON变量的代码。我使用php内置的

json\u decode

函数对json变量进行解码，但解码json变量后，我得到了NULL

$a=array("targetAction"=>"getHeadFields","targetHead"=>$table_name);
$obj1 =  Post_Uamsdata($a);
echo $obj1;

$file = json_decode($obj1,true);
var_dump($file);

$obj1是我的json变量。每当我回显它时，我得到的结果如下：

{"success":"yes","error":"","message":"","arguments":"[{\"fieldNo\":\"1\",\"fieldName\":\"ItemType\",\"fieldType\":\"character(16)\",\"notnull\":\"f\",\"fieldLabel\":null,\"primary_key\":\"f\",\"default\":null,\"fieldOption\":[]},{\"fieldNo\":\"2\",\"fieldName\":\"Long\",\"fieldType\":\"character(20)\",\"notnull\":\"f\",\"fieldLabel\":null,\"primary_key\":\"f\",\"default\":null,\"fieldOption\":[]},{\"fieldNo\":\"3\",\"fieldName\":\"Lat\",\"fieldType\":\"character(20)\",\"notnull\":\"f\",\"fieldLabel\":null,\"primary_key\":\"f\",\"default\":null,\"fieldOption\":[]},{\"fieldNo\":\"4\",\"fieldName\":\"MapDate\",\"fieldType\":\"character(16)\",\"notnull\":\"f\",\"fieldLabel\":null,\"primary_key\":\"f\",\"default\":null,\"fieldOption\":[]},{\"fieldNo\":\"5\",\"fieldName\":\"FieldNote\",\"fieldType\":\"character(64)\",\"notnull\":\"f\",\"fieldLabel\":null,\"primary_key\":\"f\",\"default\":null,\"fieldOption\":[]}]"}

---

我在在线json验证器中检查了它，它说这个json是有效的。但是，每当我将$obj1解码为$file时，我总是得到NULL。

在

json\u decode

之后，我们得到以下结果，但我想这不是您想要的。您还需要解析fieldNo、fieldName等

  $json = '{"success":"yes","error":"","message":"","arguments":"[{\"fieldNo\":\"1\",\"fieldName\":\"ItemType\",\"fieldType\":\"character(16)\",\"notnull\":\"f\",\"fieldLabel\":null,\"primary_key\":\"f\",\"default\":null,\"fieldOption\":[]},{\"fieldNo\":\"2\",\"fieldName\":\"Long\",\"fieldType\":\"character(20)\",\"notnull\":\"f\",\"fieldLabel\":null,\"primary_key\":\"f\",\"default\":null,\"fieldOption\":[]},{\"fieldNo\":\"3\",\"fieldName\":\"Lat\",\"fieldType\":\"character(20)\",\"notnull\":\"f\",\"fieldLabel\":null,\"primary_key\":\"f\",\"default\":null,\"fieldOption\":[]},{\"fieldNo\":\"4\",\"fieldName\":\"MapDate\",\"fieldType\":\"character(16)\",\"notnull\":\"f\",\"fieldLabel\":null,\"primary_key\":\"f\",\"default\":null,\"fieldOption\":[]},{\"fieldNo\":\"5\",\"fieldName\":\"FieldNote\",\"fieldType\":\"character(64)\",\"notnull\":\"f\",\"fieldLabel\":null,\"primary_key\":\"f\",\"default\":null,\"fieldOption\":[]}]"}';

 $arr = json_decode($json, true);
 echo "<pre>";
 print_r($arr);

由于该函数仅适用于UTF-8编码的字符串，请尝试以下操作：

---

无法复制-假设您的函数

Post_Uamsdata

生成您声明的JSON字符串，它将成功解码：请共享Post_Uamsdata（）的代码。只有在整个JSON字符串附加分号（；）时才可能。所以，我想您应该这样做：$file=json_decode（rtrim（$obj1，；”），true）；让我知道。你能把代码上传到服务器上，这样我们就可以查看返回的JSON吗？JSON结果返回$obj1我已经发布了结果plz see iti也通过硬编码值进行了检查。它工作正常，但当我解码返回我复制的相同字符串的JSON对象时，它会给我NULL。仍然没有得到任何结果

 Array
 (
   [success] => yes
   [error] => 
   [message] => 
   [arguments] =>  [{"fieldNo":"1","fieldName":"ItemType","fieldType":"character(16)","notnull":"f","fieldLabel":null,"primary_key":"f","default":null,"fieldOption":[]},{"fieldNo":"2","fieldName":"Long","fieldType":"character(20)","notnull":"f","fieldLabel":null,"primary_key":"f","default":null,"fieldOption":[]},{"fieldNo":"3","fieldName":"Lat","fieldType":"character(20)","notnull":"f","fieldLabel":null,"primary_key":"f","default":null,"fieldOption":[]},{"fieldNo":"4","fieldName":"MapDate","fieldType":"character(16)","notnull":"f","fieldLabel":null,"primary_key":"f","default":null,"fieldOption":[]},{"fieldNo":"5","fieldName":"FieldNote","fieldType":"character(64)","notnull":"f","fieldLabel":null,"primary_key":"f","default":null,"fieldOption":[]}]
  )

$file = json_decode(mb_convert_encoding($obj1, 'UTF-8'),true);