Update JSON File Using PHP and BackboneJS - php

Question

Trying to be able to have my website so that I can update a JSON file when I edit a cell using BackgridJS (backgridjs.com). In order to save the file to the server, this is the code I am using:
var MyModel = Backbone.Model.extend({
initialize: function () {
Backbone.Model.prototype.initialize.apply(this, arguments);
this.on("change", function (model, options) {
if (options && options.save === false) return;
model.save();
});
}
});
I want it to apply the change to the JSON file, but I figured it would be easier to use PHP. I read about how to do this on this StackOverflow Question but since I am just beginning to learn PHP, I'm very confused. I keep trying to implement that code into my file, but nothing happens when I save the cell. I'm using MAMP as a localhost.
Any and all help is appreciated.

Answer 1

Thanks to the help of #Ingro, this is the solution. In the HTML with Backbone embedded:
var data1 = JSON.stringify(this);
obj = JSON.parse(data1);
$.ajax({url:"update.php",type:"POST",data:{
"data3":obj
}});
and in the PHP file:
<?php $jsonString = file_get_contents('examples/olympics.json');
$data = json_decode($jsonString,true);
$data3 = $_REQUEST ["data3"];
$data = $data3;
$newJsonString = json_encode($data);
file_put_contents('examples/olympics.json', $newJsonString);
?>