pass values from a function to another function in controller - php

Question

i have 2 functions in a controller,
function feed()
{
$xml = simplexml_load_file('http://localhost/feed.php');
// pass to other function
$this->purchased($xml->prices);
foreach ($xml->prices as $price) {
echo ' <tr id="'.$price->sign.'"><td class="price">'.$price->wholesale.'</td>';
}
}
in the above function i take some values from a feed and append it to a html in the front end using jquery
in the below function what i do is list down all the products purchased by a particular user. this function also refreshed every 5 seconds.
function purchased($price)
{
foreach ($price as $x)
{
$retail = $x->retail;
}
}
what i need to do is get the values returned form the function feed() to the purchased function to do some calculations .. but when i use the above method i get the bellow error
Message: Undefined variable: price
Message: Missing argument 1 for Actions::purchased()
can someone tell me how can i get the prices from the feed function and use it with the purchased function?

Answer 1

Not sure if I understood what are you doing and what are you trying to achieve, but..
Passing variables works only when you call function. So, when you execute feed() function, then you call purchased() function and pass variable. purchased() works, ends, and then script goes back to the feed() function.
Calling purchased() from anywhere else doesn't give you the values from feed() function.
Try to change function to:
function purchased($price = '')
{
if (!isset ($price) || empty($price)) {
$xml = simplexml_load_file('http://localhost/feed.php');
$price = $xml->prices;
}
foreach ($price as $x) {
$retail = $x->retail;
}
}