Create playlist in SoundCloud with PHP

[coco]

I am creating a music website on which i have integrated SoundCloud API.Now I want to create a playlist at run time and attach tracks to that playlist.My code is following:\[code\]class Soundcloud { const VERSION = '1.1'; public static $urls = array( 'api' => 'http://api.soundcloud.com/', 'oauth' => array( 'access' => 'http://api.soundcloud.com/oauth/access_token', 'authorize' => 'http://soundcloud.com/oauth/authorize', 'request' => 'http://api.soundcloud.com/oauth/request_token' ) ); function __construct($consumer_key, $consumer_secret, $oauth_token = null, $oauth_token_secret = null) { $this->sha1_method = new OAuthSignatureMethod_HMAC_SHA1(); $this->consumer = new OAuthConsumer($consumer_key, $consumer_secret); if (!empty($oauth_token) && !empty($oauth_token_secret)) { $this->token = new OAuthConsumer($oauth_token, $oauth_token_secret); } else { $this->token = null; } } function get_authorize_url($token) { if (is_array($token)) { $token = $token['oauth_token']; } return $this->_get_url('authorize') . '?oauth_token=' . $token; } function get_request_token($oauth_callback) { $request = $this->request( $this->_get_url('request'), 'POST', array('oauth_callback' => $oauth_callback) ); $token = $this->_parse_response($request); $this->token = new OAuthConsumer( $token['oauth_token'], $token['oauth_token_secret'] ); return $token; } function get_access_token($token) { $response = $this->request( $this->_get_url('access'), 'POST', array('oauth_verifier' => $token) ); $token = $this->_parse_response($response); $this->token = new OAuthConsumer( $token['oauth_token'], $token['oauth_token_secret'] ); return $token; } function upload_track($post_data, $asset_data_mime = null, $artwork_data_mime = null) { $body = ''; $boundary = '---------------------------' . md5(rand()); $crlf = "\r\n"; $headers = array( 'Content-Type' => 'multipart/form-data; boundary=' . $boundary, 'Content-Length' => 0 ); foreach ($post_data as $key => $val) { if (in_array($key, array('track[asset_data]', 'track[artwork_data]'))) { $body .= '--' . $boundary . $crlf; $body .= 'Content-Disposition: form-data; name="' . $key . '"; filename="' . basename($val) . '"' . $crlf; $body .= 'Content-Type: ' . (($key == 'track[asset_data]') ? $asset_data_mime : $artwork_data_mime) . $crlf; $body .= $crlf; $body .= file_get_contents($val) . $crlf; } else { $body .= '--' . $boundary . $crlf; $body .= 'Content-Disposition: form-data; name="' . $key .'"' . $crlf; $body .= $crlf; $body .= $val . $crlf; } } $body .= '--' . $boundary . '--' . $crlf; $headers['Content-Length'] += strlen($body); return $this->request('tracks', 'POST', $body, $headers); } function request($resource, $method = 'GET', $args = array(), $headers = null) { if (!preg_match('/http:\/\//', $resource)) { $url = self::$urls['api'] . $resource; } else { $url = $resource; } if (stristr($headers['Content-Type'], 'multipart/form-data')) { $body = false; } elseif (stristr($headers['Content-Type'], 'application/xml')) { $body = false; } else { $body = true; } $request = OAuthRequest::from_consumer_and_token( $this->consumer, $this->token, $method, $url, ($body === true) ? $args : null ); $request->sign_request($this->sha1_method, $this->consumer, $this->token); return $this->_curl( $request->get_normalized_http_url(), $request, $args, $headers ); } private function _build_header($headers) { $h = array(); if (count($headers) > 0) { foreach ($headers as $key => $val) { $h[] = $key . ': ' . $val; } return $h; } else { return $headers; } } private function _curl($url, $request, $post_data = http://stackoverflow.com/questions/3674093/null, $headers = null) { $ch = curl_init(); $mime = (stristr($headers['Content-Type'], 'multipart/form-data')) ? true : false; $headers['User-Agent'] = (isset($headers['User-Agent'])) ? $headers['User-Agent'] : 'PHP SoundCloud/' . self::VERSION; $headers['Content-Length'] = (isset($headers['Content-Length'])) ? $headers['Content-Length'] : 0; $headers = (is_array($headers)) ? $this->_build_header($headers) : array(); $options = array( CURLOPT_URL => $url, CURLOPT_HEADER => false, CURLOPT_RETURNTRANSFER => true ); if (in_array($request->get_normalized_http_method(), array('DELETE', 'PUT'))) { $options[CURLOPT_CUSTOMREQUEST] = $request->get_normalized_http_method(); $options[CURLOPT_POSTFIELDS] = ''; } if (is_array($post_data) && count($post_data) > 0 || $mime === true) { $options[CURLOPT_POSTFIELDS] = (is_array($post_data) && count($post_data) == 1) ? ((isset($post_data[key($post_data)])) ? $post_data[key($post_data)] : $post_data) : $post_data; $options[CURLOPT_POST] = true; } $headers[] = $request->to_header(); $options[CURLOPT_HTTPHEADER] = $headers; curl_setopt_array($ch, $options); $response = curl_exec($ch); $this->http_status = curl_getinfo($ch, CURLINFO_HTTP_CODE); curl_close($ch); return $response; } private function _get_url($type) { return (array_key_exists($type, self::$urls['oauth'])) ? self::$urls['oauth'][$type] : false; } private function _parse_response($response) { parse_str($response, $output); return (count($output) > 0) ? $output : false; }}\[/code\]and \[code\] $soundcloud = new Soundcloud( $consumer_key, $consumer_secret, $_SESSION['oauth_access_token'], $_SESSION['oauth_access_token_secret'] );$post_data1 = array('playlist[title]'=>'This is my set' ); $headers = array('Content-Type' => 'application/xml'); $soundcloud->request('playlists', 'POST', $post_data1,$headers);\[/code\]But it's not creating any playlist.