獲取Steam庫存

Question

我想查看網站中用戶的庫存。我真的得到函數拿到盤點CS：GO：

function getInventory($steamapi, $steamid, $userid) { 
} 

$url = "http://api.steampowered.com/ISteamUser/GetPlayerSummaries/v0002/?key=$steamapi&steamids=$steamid"; 
$json_object = file_get_contents($url); 
$json_decoded = json_decode($json_object); 

$str = $json_decoded->response->players[0]->steamid; 

$urlInv = "http://steamcommunity.com/profiles/" . $str . "/inventory/json/730/2/?trading=1"; 

$json_object_inv = file_get_contents($urlInv); 
$json_decoded_inv = json_decode($json_object_inv, true); 

$rgInventory = $json_decoded_inv[rgInventory]; 
$rgInventory = array_values($rgInventory); 

$rgDesc = $json_decoded_inv[rgDescriptions]; 
$rgDesc = array_values($rgDesc); 

$itemnames = array(); 

******* 
}} 

當我使用這個，我有這樣的煩惱：

Warning: array_values() expects parameter 1 to be array, null given in ***\functions.php on line 278 //this 20 string 

Warning: array_values() expects parameter 1 to be array, null given in ***\functions.php on line 281 //this 23 string 

這是什麼？ 謝謝你。

Answer 1

如果解碼失敗，json_decode返回null：https://secure.php.net/manual/en/function.json-decode.php