问Steam解码URL json

EN

<?php

     $items = array("Exalted Manifold Paradox","Kinetic Gem","Mercurial's Call");
        foreach($items as $item)
        {
            $json = json_decode(file_get_contents("http://steamcommunity.com/market/priceoverview/?appid=570&market_hash_name=".rawurlencode($item)), true);
            if($json["success"] == true OR !empty($json))
            {
                echo $item."'s lowest price is ".$json["lowest_price"]."";
            }
            elseif($json["success"] == false OR empty($json))
            {
                echo "Could not get data for ".$item;
            }
        }

Exalted Manifold Paradox's lowest price is $28.49Kinetic Gem's lowest price is $50.00Mercurial's Call's lowest price is $0.16

When I am trying to implent this snippet to my code I get error in my result:

I have created an array that contains different weapons:
<?
    foreach($S_W as $item) // Steam weapon
    {
    echo $item;
    }

?>

AWP | Worm God (Factory New)
FAMAS | Cyanospatter (Field-Tested)
G3SG1 | Green Apple (Factory New)
G3SG1 | Polar Camo (Field-Tested)
Glock-18 | Death Rattle (Field-Tested)
M249 | Gator Mesh (Field-Tested)
MAC-10 | Heat (Field-Tested)

foreach($S_W as $item)
{
    $json = json_decode(file_get_contents("http://steamcommunity.com/market/priceoverview/?appid=570&market_hash_name=".rawurlencode($item)), true);
    if($json["success"] == true OR !empty($json))
    {
        echo $item."'s lowest price is ".$json["lowest_price"]."";
    }
    elseif($json["success"] == false OR empty($json))
    {
        echo "Could not get data for ".$item;
    }
}