- file_get_contents: documentation ( source)
- json_decode: documentation ( source)
<?php
$url = 'http://steamcommunity.com/market/priceoverview/?country=NL¤cy=1&appid=730&market_hash_name=P90%20%7C%20Asiimov%20%28Factory%20New%29';
$json = json_decode(file_get_contents($url), true);
echo $json["lowest_price"];
?>