Alerting Javascript array object shows empty

Question

I am trying to send the JavaScript array to my php, but php gets empty [].
It even shows like that in my browser. I have always sent JSON and had no problem, but now have this format.

I have this example that makes no sense...it's just a code to illustrate the issue:

var blah    = [];
var letters = ['a', 'b', 'c', 'd'];

for (var i = 0; i < letters.length; i++)
{
    blah[letters[i]] = i;
}

Inside firebug DOM it shows as follows:

blah      []
    a      0
    b      1
    c      2
    d      3

When I do

1. alert(blah) ------------------------------- I get empty
2. alert(JSON.stringify(blah)) ----- I get []
3. alert(blah.a) ---------------------------- I get 0

So how can I pass this object to php? Thanks

Answer 1

Instead of an array, try using an object.

So instead of:

var blah    = [];

Try

var blah    = {};

Answer 2

Arrays are continuously numerically indexed. They do not have strings as key names.
What you want is an object {}, not an array [].