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我有以下生成 JSON 变量的代码。我使用 php 内置json_decode函数来解码 json 变量，但在解码 JSOn 变量后我得到 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\":[]}]"}

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

4

2 回答 2

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在json_decode我们得到以下内容后，但我想这不是你想要的。您还希望解析 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);

输出如下

 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":[]}]
  )
于 2013-09-24T05:35:31.337 回答
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由于http://php.net/manual/en/function.json-decode.php表明该函数仅适用于 UTF-8 编码的字符串，请尝试以下操作：

$file = json_decode(mb_convert_encoding($obj1, 'UTF-8'),true);
于 2013-09-24T05:54:34.353 回答