php script to get info from mpd server

<?php
//
// this script is used in conjunction with the javascript found here --> https://pastebin.com/r534eH9w
//
// mpd server host & port
//
$host="<mpd server name or IP address>";
$port="6600";

// determine player state (play, stopped)

$playerStatus = getStatus("status",$host,$port);

$state = stripColon($playerStatus['9']);

if ($state == "stop") {
        echo "0";
        exit(0);
}
// get parameter from URL not actually required with the latest version and
// could be preset as only a single parameter (playlist) is required - assigned to $item below
//
$item = check_input($_GET['id']);
//
// determine if playing radio or local media
//
$type = getStatus("currentsong",$host,$port);
        $file_type = stripColon($type['1']);
        if (empty($file_type)) {
        echo "No current song information returned\n";
        die();
        }
        if (strpos($file_type, 'http') !==false) {
                // echo "Playing  radio";
                $play_status = "radio";
        } else {
                // echo "Playing local media  ";
                $play_status = "local_media";
}
//
// get playlist id if playing radio (different array returned for radio and local media)
//
if (($item == "playlist") && ($play_status == "radio")) {
        $playlist = getStatus("status",$host,$port);
        $playlist = stripColon($playlist['6']);
        echo $playlist;
        if (empty($playlist)) {
        echo "No playlist information returned\n";
        die();
        }
}
//
// get playlist id if playing local media
//
if (($item == "playlist") && ($play_status == "local_media")) {
        $playlist = getStatus("status",$host,$port);
        $playlist = stripColon($playlist['11']);
        echo $playlist;
        if (empty($playlist)) {
        echo "No playlist information returned\n";
        die();
        }
}

function stripColon($opt) {
        if (!empty($opt)) {
        $state=explode(":",$opt);
        $opt=$state['1']; // get 2nd item in array $state
        $opt = trim($opt);
        } else {
        $opt = "Playlist state is unknown\n";
        die();
        }
        return $opt;
}

function getStatus($opt,$host,$port) {
$mpd_sock = fsockopen($host, $port, $errno, $errstr, 5);
$mpd_data="";

if (!$mpd_sock) {
        echo "$errstr ($errno)<br>";
        } else {
        fwrite($mpd_sock, $opt . "\n");
        usleep(250000);
        fwrite($mpd_sock, "\n");
//      print_r($mpd_data); // debugging

        while (!feof($mpd_sock)) {
                $mpd_data .= fgets($mpd_sock);
                }
                $mpd_status = explode("\n", $mpd_data);
                fwrite($mpd_sock, "\n");
                return $mpd_status;
        }
        fclose($mpd_sock);
}

function check_input($data) {
        $data = trim($data);
        $data = strip_tags($data);
        $data = stripslashes($data);
        $data = htmlspecialchars($data, ENT_QUOTES, 'UTF-8');
        $data = filter_var($data, FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_HIGH);
        return $data;
}
?>