xbmc json command

<?php
$XBMC_USER = "";
    $XBMC_PASS = "";
    $XBMC_IP = "localhost";
    $XBMC_PORT = "8080";
    $url = "";
    $rurl = "";

    if($XBMC_PASS == ""){
        $url = "http://" . $XBMC_IP . ":" . $XBMC_PORT . "/jsonrpc";
        $rurl = 'http://'.$XBMC_IP.':'.$XBMC_PORT.'/';
    } else{
        $url = "http://" . $XBMC_USER . ":" . $XBMC_PASS . "@" . $XBMC_IP . ":" . $XBMC_PORT . "/jsonrpc";
        $rurl = 'http://'.$XBMC_USER.':'.$XBMC_PASS.'@'.$XBMC_IP.':'.$XBMC_PORT.'/';
    }

$coverart = '{"jsonrpc":"2.0","method":"Player.GetItem","params":{"playerid":1,"properties":["art"]},"id":1}';

$raw_art = "";
$art = rawurldecode($raw_art);
?>
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Untitled Document</title>
</head>

<body>

<img src="<?php echo $art ?>" width="136" height="200">

</body>
</html>