<?php
// Error reporting
error_reporting(E_ALL^E_NOTICE);

// Validating the input data:
if(!is_numeric($_GET['id']) || !is_numeric($_GET['x']) || !is_numeric($_GET['y']) || !is_numeric($_GET['z']))
die("0");

// Escaping:
$id = (int)$_GET['id'];
$x = (int)$_GET['x'];
$y = (int)$_GET['y'];
$z = (int)$_GET['z'];


// Saving the position and z-index of the note:
$xmla = simplexml_load_file('../db/notes.xml');

$target = -1;
$i = 0;

foreach ($xmla->note as $s) {
  if ($s['id']==$id) { $target = $i; break; }
  $i++;
}

$xmla->note[$target]->top = $y;
$xmla->note[$target]->left = $x;
$xmla->note[$target]->zindex = $z;


$xmla->asXML('../db/notes.xml');

echo $target;
?>