Drupal redirection - redirect

Question

I am working on a project and there is a custom module in that which have the drupal redirection code in it here is the code :
if (empty($_GET['destination'])
&& isset($_COOKIE["abc"])
&& $_COOKIE["abc"]<>''
&& ($_POST['form_id'] != 'user_pass_reset'))
{
$_GET['destination'] = "xyz" ;
}
}
Can anyone please explain the 3rd line of code or maybe all of it. Thanks

Answer 1

I have added comments to the source. <> is the same as !=. See PHP Comparison Opperators.
if (empty($_GET['destination']) //Check if $_GET['destination'] is empty.
&& isset($_COOKIE["abc"]) //Check if $_COOKIE["abc"] is not NULL.
&& $_COOKIE["abc"]<>'' //Check if $_COOKIE["abc"] does not equal an empty string.
&& ($_POST['form_id'] != 'user_pass_reset')) //Check if $_POST['form_id'] is not 'user_pass_reset'
{
$_GET['destination'] = "xyz" ; //Set $_GET['destination'] to "xyz"
}
}

Answer 2

should be modify a little bit in second line
if (empty($_GET['destination']) //Check if $_GET['destination'] is empty.
&& isset($_COOKIE["abc"]) //Check if $_COOKIE["abc"] is EXISTS.
&& $_COOKIE["abc"]<>'' //Check if $_COOKIE["abc"] does not equal an empty string.
&& ($_POST['form_id'] != 'user_pass_reset')) //Check if $_POST['form_id'] is not 'user_pass_reset'
{
$_GET['destination'] = "xyz" ; //Set $_GET['destination'] to "xyz"
}
}