Writing an ajax variable to txt file - php

Question

I have a facebook application coded client side and I want to store the tokens on my server for later use
There is a variable called 'token' and I then create a new function called 'apple' to write this variable in a json format to a txt file
$(document).ready(function(){
$("#submit").click(function(){
//access token stuff
var token = $("#link_input").val();
//alert("Got Token: " + token + ". your application token");
if (token.split('#access_token=')[1]) {
var token = token.split('#access_token=')[1].split('&')[0];
//alert(token);
function WriteToFile(apple)
{
$.post("save.php",{ 'token': apple },
function(data){
alert(data);
}, "text"
);
return false;
}
My php file
<?php
$thefile = "new.json"; /* Our filename as defined earlier */
$towrite = $_POST["token"]; /* What we'll write to the file */
echo $towrite;
$openedfile = fopen($thefile, "w");
$encoded = json_encode($towrite);
fwrite($openedfile, $encoded);
fclose($openedfile);
return "<br> <br>".$towrite;
?>
but i cant get it to write anything

Answer 1

As it stands now, you define your WriteToFile function in JS, but you never call it.
Change your JS to something like:
$(document).ready(function(){
$("#submit").click(function(){
//access token stuff
var token = $("#link_input").val();
//alert("Got Token: " + token + ". your application token");
if (token.split('#access_token=')[1]) {
var token = token.split('#access_token=')[1].split('&')[0];
WriteToFile(token);
}
}
function WriteToFile(apple) {
$.post("save.php",{ 'token': apple },
function(data){
alert(data);
}, "text");
return false;
}
};
Or:
$(document).ready(function(){
$("#submit").click(function(){
//access token stuff
var token = $("#link_input").val();
//alert("Got Token: " + token + ". your application token");
if (token.split('#access_token=')[1]) {
var token = token.split('#access_token=')[1].split('&')[0];
$.post("save.php",{ 'token': token }, function(data){
alert(data);
}, "text");
}
}
};

Answer 2

You must first create the file in the location and then set the right permissions or the PHP will not be able to write it.