json_decode期望参数1为字符串，表示给出了数组。 为什么我的字符串没有正确传递？

Question

So, I've been struggling with this for the entire weekend and I still can't figure out what's wrong. I'm trying to pass some data through json_decode to be able to save it to a file and I keep getting the error it expects a string but an array is given. I'm using jQuery and PHP.

The data I send through the ajax call is, according to console.log(noBrack):

{"ID":2,"LLID":"LLID2","volNaam":"Test - 0","norm":"Zicht","instalDatum":"17-11-2017","endDate":"18-11-2017","serie":"0","klant":"Testklant","file":"data/Testklant (Heerenveen)/LLID2.json","gelDat":"27-10-2018"}

My Ajax call is:

$.ajax({
  url: 'quickGrade.php',
  type: 'POST',
  data: noBrack,
  datatype: 'json',
  success:function(data){
    alert(data );
  }
});

My PHP code is:

$testSave = 'data/gradeTest.json';
$decode = json_decode($_POST, true);
file_put_contents($testSave, $decode);

Can anyone find out what I'm doing wrong? I've tested my string with an online json_decode tester and it said it was valid so I'm kinda hardstuck here.

Answer 1

The way you are sending data will give you $_POST array in php code. So actually you do not need to decode because the data is coming as $_POST array not a JSON string.