Getting JSON IN PHP

Question

I am trying to pass a JSON object to a PHP page, this is my jquery script.

        reg_id   = $('#registroid').val();
        razonid = $("#selectRazonId").val();
        $.ajax({
            data: JSON.stringify({myData:{razonid:razonid,reg_id:reg_id}}),
            type: "POST",
            dataType: "json",
            url: "inc/sitctp0013Procesa-2.php",
            contentType: "application/json; charset=utf-8",
            success: function(data){ 
                alert(data);
            }
        });

And this is my PHP script

 <?php
 $myPostData = json_decode($_POST['myData']);
 $firstname = $myPostData["razonid"];
 $lastname = $myPostData["reg_id"];
 if($myPostData){
        echo "good";
 } else{
    echo "bad";
 }
 ?>

but is only printing "bad", I tried doing a var_dump($_POST); but I'm getting a null result.

If I look at the firebug console I can see that the JSON object it is being sent

https://i.sstatic.net/9aQ5o.jpg

jQuery handles encoding the data for you. You don't need to use JSON.stringify, drop that part. It should just be data: { myData: { ... } }. You also don't need the contentType option. — user229044
– user229044 ♦, Commented Jul 30, 2014 at 18:34
@meagar if I remove the stringify, the object is sent like this "myData%5Brazonid%5D=3&myData%5Breg_id%5D=70212" and still not working — Mister_Mister_84
– Mister_Mister_84, Commented Jul 30, 2014 at 18:37

Sam Dufel · Accepted Answer · 2014-07-30 18:36:18Z

1

The default return value of json_decode() is an object - if you want an associative array, you'll need to pass true as the second parameter.

$myPostData = json_decode(file_get_contents('php://input'), true);

answered Jul 30, 2014 at 18:36

Sam Dufel

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1 Comment

Mister_Mister_84 Over a year ago

thank you! this is what I was missing, I couldn't find anything related to the file_get_contents while I was researching.

Marc B · Accepted Answer · 2014-07-30 18:36:25Z

0

You're double json-encoding your data. You've already told jquery that you're sending/receiving JSON, yet are encoding your object data to json yourself.

Jquery has absolutely NO way of telling that the string coming out of JSON.stringify is actually json. It never sees that json.stringify was actually called. It just sees a string, and re-encodes it again, so your

{"myData":.....}

string comingo out of the stringify call will be turned into

"{\"myData\":.....}"

All you need is:

 data: {myData:.....}

answered Jul 30, 2014 at 18:36

Marc B

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