Global variable change to null after calling an action in controller - cakephp

Question

I want to call delete action, but my global variable sets to null.
Controller:
App::uses('AppController', 'Controller');
class WhitelistController extends AppController
{
public $helpers = array('Html', 'Form');
private $deletes;
public function index()
{
if ($this->request->is('post'))
{
$whitelist = $_POST['data']['whitelist']['stylecodes'];
if($whitelist == "")
return $this->Session->setFlash('You did not enter stylecodes. If you send this, it will delete all the shoes from the website.');
$whitelist = preg_replace('/\s+/', '', $whitelist);
$whitelist = explode(",", $whitelist);
$url = 'http://fonda.vps.***********/product_import_json_all_published_products';
$ch = curl_init($url);
curl_setopt( $ch, CURLOPT_POST, 1);
curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt( $ch, CURLOPT_HEADER, 0);
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1);
$all = curl_exec($ch);
$all = json_decode($all, true);
print_r($all);
$this->deletes = array_diff($all, $whitelist);
if($this->deletes == $all)
return $this->Session->setFlash('It seems you entered wrong data, what could delete all of the shoes from the website.');
$this->deletes = array_values($this->deletes);
pr($this->deletes);
$this->set('delete', $this->deletes);
$this->render('delete');
}
}
public function delete()
{
if($this->request->is('post'))
{
}else{
$url = 'http://fonda.vps.*******/product_import_json_remove';
$myvars = 'products=' . json_encode($this->deletes);
print_r();
pr($myvars);
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $myvars);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$response = curl_exec($ch);
$response = json_decode($response, true);
pr($response);
$removed = count($response['removed']);
$skipped = count($response['skipped']);
$string = $removed . " shoe(s) removed and " . $skipped . " shoe(s) skipped.";
$this->Session->setFlash($string);
if (count($response['error']) != 0) {
$string = "";
echo " ";
foreach ($response['error'] as $key => $value) {
$string .= $key . ": " . $value;
$string .= "\n";
}
$this->Session->setFlash('Error found in following shoe(s): ' . $string);
}
return $this->redirect(array( 'action' => 'index'));
}
}
}
$this->deletes gets null after calling the delete() from the view.
I don't see anything that changes the deletes value.
What is the problem?

Answer 1

I think I figured it out. I removed the global variable, and i put the local variable to a session in the first action:
$this->Session->write('deletes', $delete);
And i read it in the second action like this:
$delete = $this->Session->read('deletes');
so i could work with the $delete in the second action.