PHP模拟登陆网站出现会话超时

<?php        $url="http://60.219.165.24/loginAction.do";        $ch = curl_init();        curl_setopt($ch, CURLOPT_URL, $url);        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);	curl_setopt($ch, CURLOPT_HEADER, 0); 	curl_setopt($ch, CURLOPT_POST, 1);	$curlPost="postdata";	curl_setopt($ch, CURLOPT_POSTFIELDS, $curlPost);         curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);         curl_setopt($ch, CURLOPT_UNRESTRICTED_AUTH, 1);         $output = curl_exec($ch);         curl_close($ch);$home_url = 'http://60.219.165.24/gradeLnAllAction.do?type=ln&oper=fainfo&fajhh=2615';	  header('Location: '.$home_url);?>