phpcurl模拟登录百度首页,该如何处理

$url = "https://passport.baidu.com/?login&tpl=mn";
//$url = "http://www.baidu.com/";
$cookdir = "d:/www/html/mndl/cookie.txt";
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, FALSE); //这句是必须有的  设定为不验证证书 下面是不验证host。
curl_setopt ($ch, CURLOPT_HEADER, 0);   
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_COOKIEJAR, $cookdir); //保存cookies 发送用户浏览器信息 发送访问来源
curl_setopt ($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)");
curl_setopt ($ch, CURLOPT_REFERER, "http://www.baidu.com/");
$contents = curl_exec($ch);
curl_close($ch);

/* 原始表单样式
				
				
				
				
				
				
				
				
				
				
				
				
				
				
				
				
*/
$post_fields = array();
$post_fields = preg_data($contents,'aid',$post_fields);
$post_fields = preg_data($contents,'isphone',$post_fields);
$post_fields['mem_pass'] = 'on'; //post 数据数组  记住我的登录状态
$post_fields = preg_data($contents,'more_param',$post_fields);
$post_fields = preg_data($contents,'need_coin',$post_fields);
$post_fields = preg_data($contents,'need_pay',$post_fields);
$post_fields = preg_data($contents,'next_target',$post_fields);
$post_fields['password'] = 'password'; //post 数据数组  记住我的登录状态
$post_fields = preg_data($contents,'pay_method',$post_fields);
$post_fields = preg_data($contents,'psp_tt',$post_fields);
$post_fields = preg_data($contents,'return_method',$post_fields);
$post_fields = preg_data($contents,'return_type',$post_fields);
$post_fields = preg_data2($contents,'safeflg',$post_fields);
$post_fields = preg_data($contents,'skip_ok',$post_fields);
$post_fields = preg_data($contents,'tpl',$post_fields);
$post_fields = preg_data($contents,'tpl_ok',$post_fields);
$post_fields['u'] = 'http://www.baidu.com/';
$post_fields['username'] = 'username'; //post 数据数组  记住我的登录状态
$post_fields['verifycode'] = '';

$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_HEADER, 0);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_POST, 1);
curl_setopt ($ch, CURLOPT_POSTFIELDS, $post_fields);
curl_setopt ($ch, CURLOPT_COOKIEJAR, $cookdir);
curl_setopt ($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)");
curl_setopt ($ch, CURLOPT_REFERER, "https://passport.baidu.com/?login&tpl=mn");
curl_exec($ch);
curl_close($ch);

$url = "http://www.baidu.com/";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_COOKIEFILE, $cookdir);
curl_setopt ($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)");
curl_setopt ($ch, CURLOPT_REFERER, "http://www.baidu.com/n");

$contents = curl_exec($ch);print_r($contents);die;
curl_close($ch);

exit;
function preg_data($source,$chr,$array){
		preg_match('//i', $source, $matches);
		if(!empty($matches)) {
		    $a = $matches[1];
		} else {
		    die('Not found the '.$chr.'.');
		}
		$array[$chr]=$a;
		return $array;
}function preg_data2($source,$chr,$array){
		preg_match('//i', $source, $matches);
		if(!empty($matches)) {
		    $a = $matches[1];
		} else {
		    die('Not found the '.$chr.'.');
		}
		$array[$chr]=$a;
		return $array;
}
?>