I find solution for getting id's from API to my website.
But, I still don't know how to replace this: (from http://api.steampowered.com/IEconItems_440/GetPlayerItems/v0001/?key=APIKEY&steamid=76561198108107219&format=json)
"id": 1960542190,
"defindex": 744,
With this: (from http://api.steampowered.com/IEconItems_440/GetSchema/v0001/?key=APIKEY)
"name": "Pyrovision Goggles",
"defindex": 744,
I'm using this:
$url = "http://api.steampowered.com/IEconItems_440/GetPlayerItems/v0001/?key=" . $api_key . "&steamid=" . $idc . "&format=json";
$json_object= file_get_contents($url);
$json_decoded = json_decode($json_object);
foreach ($json_decoded->result->items as $item)
{
$items[$item->id]['id'] = $item->id;
$items[$item->id]['original_id'] = $item->original_id;
$items[$item->id]['defindex'] = $item->defindex;
$items[$item->id]['level'] = $item->level;
$items[$item->id]['quality'] = $item->quality;
echo $item->defindex; echo "<br>";
}