Question

I am creating a JSON object dynamically and when I send it via an ajax POST I get Disallowed Key Characters as the response. I know that my object is ok because I can create the SAME EXACT object manually and it sends fine. I tried escape() on all of my strings before adding them to the obj but that did not work either.

Am I missing something?

This is my post

$.ajax({
    type: 'POST',

    url: 'http://localhost/test',
    data: obj,
    dataType : 'JSON',
    success: function(){
        console.log('nice');
    }
});

I am using the same obj as in this post

Add to JSON without knowing its structure

Answer 1

It turns out that this error was caused by CI’s input library. On line 215 you will find _clean_input_keys function which uses preg_match() to disallow certain characters in your keys. So when you send JSON around and php recieves it as an array it can throw an error.

To fix this you can either extend the library or edit the CI core.