JavaScript数组到PHP

i want to send a javascript array to php using jquery ajax.

$.post("controllers/ajaxcalls/users.php",
{
    links: links
});

where the second 'links' is a javascript array.

when i've got this array:

'1' ...
    '1' => "comment1"
    '2' => "link1"
    '3' => "link2"
    '4' => "link3"
'2' ...
    '1' => "comment2"
    '2' => "link4"

then using:

var jsonLinks = JSON.stringify(links);
alert(jsonLinks);

will give me:

[null,[null,"comment1","link1","link2","link3"],[null,"comment2","link4"]]

seems to me that something is wrong. what are the null:s and i cant use json_decode on php side to get the elements.

what function should i use to convert it to json and how do i access it on the php side?

tried this http://code.google.com/p/jquery-json/ but it will give exactly the same output as JSON.stringify() (they also say that in the documentation).

have struggled with this in some hours now...would appreciate some SPECIFIC help.

i just want to send an array from javascript to php...why is that so damn difficult:/

There are some jQuery plugin that can encode to JSON (and decode from JSON).


For instance, you can take a look at jquery-json (quoting) :

This plugin exposes four new functions onto the $, or jQuery object:

  • toJSON: Serializes a javascript object, number, string, or arry into JSON.
  • evalJSON: Converts from JSON to Javascript, quickly, and is trivial.
  • secureEvalJSON: Converts from JSON to Javascript, but does so while checking to see if the source is actually JSON, and not with other Javascript statements thrown in.
  • quoteString: Places quotes around a string, and inteligently escapes any quote, backslash, or control characters.

I'm not sure how you are trying to read this in your PHP script, but if it is related to you having 1-based arrays rather than 0-based arrays, then in javascript, you can remove the nulls (zeroth element) with:

var jsonLinks = JSON.stringify(links.slice(1));

Answering the null part, JavaScript arrays are numeric and zero based:

>>> var foo = [];
>>> foo[5] = 'Five';
"Five"
>>> foo
[undefined, undefined, undefined, undefined, undefined, "Five"]

On the contrary, PHP allows missing (and mixed) keys:

<?php

$foo = array();
$foo[5] = 'Five';
print_r($foo);

?>

Array
(
    [5] => Five
)

If you want to use arrays, I suggest you make them zero-based and prevent missing values. Otherwise, you could probably use objects instead.