Return PHP array after AJAX call

Question

I'm sending an JS object via $.post() and I want to get an array back.

JS

var ajaxData = {action:"createuser"}
$("input[required]").each(function(){
    var attr = $(this).attr("name");
    ajaxData[attr] = $(this).val();
});
$.post(
    daten.ajaxurl,
    ajaxData, 
    function(data){
       alert(data[0])
    }        
 )

PHP

//Create a User
add_action('wp_ajax_nopriv_createuser','createuser');
function createuser () {
    foreach ($_POST as $key => $value) {
        if(empty($value)) {
            $type = "error";
            $content = "$key is empty";
            echo array($type,$content);
            wp_die();
        }
    }
}

What I get as a response is always a string, so it works well if I echo $content.

I've read about that you can use JSON and get it automatically encode if you add DataTaype: "JSON".

But I have no idea how to properly decode it in PHP, tho

Just do echo json_encode(array($type, $content)). I assume that's what you mean. — Andrei
– Andrei, Commented Oct 28, 2016 at 9:31
@Andrew now I get an object back. I assume it's a JSON object. How can I turn it into an array? — Kode Bryant
– Kode Bryant, Commented Oct 28, 2016 at 9:36
You can use JSON Parse from javascript to read the information in the json. — Andrei
– Andrei, Commented Oct 28, 2016 at 9:56

muka.gergely · Accepted Answer · 2016-10-28 10:48:41Z

2

I would use the wp_send_json(); function. This is exactly the thing you look for.

And don't forget to put wp_die() at the end.

wp_send_json(): https://codex.wordpress.org/Function_Reference/wp_send_json

wp_die(): https://codex.wordpress.org/Function_Reference/wp_die

answered Oct 28, 2016 at 10:48

muka.gergely

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3 Comments

Kode Bryant Over a year ago

You are awesome! Is the wp_die() necessary, as wp_send_json() fires die() ?

Niels van Renselaar Over a year ago

You don't have to use wp_die with this function

muka.gergely Over a year ago

No, it's not necessary, as wp_send_json() includes die(). But it is "best practice" - one line of code and you sleep better :D

Niels van Renselaar · Accepted Answer · 2016-10-28 09:34:33Z

1

You can't just echo an array. In AJAX it's considered default to return JSON objects in requests. What you want to do is make an JSON object from the array. You can use json_encode for that.

http://php.net/json_encode

After that you can use the JSON object in JS/jQuery to do whatever you want to do with it.

answered Oct 28, 2016 at 9:34

Niels van Renselaar

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