/**

*  post数据

*  @param string $url        post的url

*  @param int $limit        返回的数据的长度

*  @param string $post        post数据，字符串形式username='dalarge'&password='123456'

*  @param string $cookie    模拟 cookie，字符串形式username='dalarge'&password='123456'

*  @param string $ip        ip地址

*  @param int $timeout        连接超时时间

*  @param bool $block        是否为阻塞模式

*  @return string            返回字符串

*/

private function _ps_post($url, $limit = 0, $post = '', $cookie = '', $ip = '', $timeout = 15, $block = true) {

$return = '';

$matches = parse_url($url);

$host = $matches['host'];

$path = $matches['path'] ? $matches['path'].($matches['query'] ? '?'.$matches['query'] : '') : '/';

$port = !empty($matches['port']) ? $matches['port'] : 80;

$siteurl = $this->_get_url();

if($post) {

$out = "POST $path HTTP/1.1\r\n";

$out .= "Accept: */*\r\n";

$out .= "Referer: ".$siteurl."\r\n";

$out .= "Accept-Language: zh-cn\r\n";

$out .= "Content-Type: application/x-www-form-urlencoded\r\n";

$out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";

$out .= "Host: $host\r\n" ;

$out .= 'Content-Length: '.strlen($post)."\r\n" ;

$out .= "Connection: Close\r\n" ;

$out .= "Cache-Control: no-cache\r\n" ;

$out .= "Cookie: $cookie\r\n\r\n" ;

$out .= $post ;

} else {

$out = "GET $path HTTP/1.1\r\n";

$out .= "Accept: */*\r\n";

$out .= "Referer: ".$siteurl."\r\n";

$out .= "Accept-Language: zh-cn\r\n";

$out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";

$out .= "Host: $host\r\n";

$out .= "Connection: Close\r\n";

$out .= "Cookie: $cookie\r\n\r\n";

}

$fp = @fsockopen(($ip ? $ip : $host), $port, $errno, $errstr, $timeout);

if(!$fp) return '';

stream_set_blocking($fp, $block);

stream_set_timeout($fp, $timeout);

@fwrite($fp, $out);

$status = stream_get_meta_data($fp);

if($status['timed_out']) return '';

while (!feof($fp)) {

if(($header = @fgets($fp)) && ($header == "\r\n" ||  $header == "\n"))  break;

}

$stop = false;

while(!feof($fp) && !$stop) {

$data = fread($fp, ($limit == 0 || $limit > 8192 ? 8192 : $limit));

$return .= $data;

if($limit) {

$limit -= strlen($data);

$stop = $limit <= 0;

}

}

@fclose($fp);

//部分虚拟主机返回数值有误，暂不确定原因，过滤返回数据格式

$return_arr = explode("\n", $return);

if(isset($return_arr[1])) {

$return = trim($return_arr[1]);

}

unset($return_arr);

return $return;

}