fsockopen模拟post/get请求 ---转自：https://www.cnblogs.com/ahwu/p/3287202.html

<?php
/*
模拟发送GET和POST
*/
class HttpFsockopen{
    const EOF = "\r\n";
    private $errno = -1;
    private $error = '';
    private $respons = '';
    private $url     = array();
    private $line     = array();
    private $header = array();
    private $body     = array();
    private $ver     = 'HTTP/1.1'; //http协议
    private $fh        = null;

    public function __construct($url){
        $this->conn($url);
        $this->setHeader('Host: '.$this->url['host']);
    }

    //设置写请求行
    private function setLine($method){
        $this->line[0] = $method. ' '.$this->url['path'].'?'.$this->url['query'].' '.$this->ver;
    }

    //设置写头信息
    public function setHeader($header){
        $this->header[] = $header;
    }

    //设置写主体信息
    private function setBody($body=array()){
        $this->body[] = http_build_query($body);
    }

    //连接URL
    private function conn($url){
        $this->url = parse_url($url);
        if(!isset($this->url['port'])) $this->url['port'] = 80;
        $this->fh  = fsockopen($this->url['host'],$this->url['port'],$this->errno,$this->error,5);
    }

    //构造GET请求
    public function get(){
        $this->setLine('GET');
        $this->request();
        return $this->respons;
    }

    //构造POST请求
    public function post($body=array()){
        $this->setLine('POST');
        # content-type
        $this->setHeader('Content-type:application/x-www-form-urlencoded');
        # 构造主体信息
        $this->setBody($body);
        # content-length
        $this->setHeader('content-length:'.strlen($this->body[0]));

        return $this->request();
    }

    //请求
    private function request(){
        //把请求行头信息,实体信息,放在一个数组里,便于拼接
        $req = array_merge($this->line,$this->header,array(''),$this->body,array(''));
        $req = implode(self::EOF, $req);
        fwrite($this->fh, $req);
        while(!feof($this->fh)){
            $this->respons .= fread($this->fh,1024);
        }
        $this->close(); //关闭连接
        return $this->respons;        
    }

    //关闭连接
    private function close(){
        fclose($this->fh);
    }

}

$url = 'http://sports.sina.com.cn/nba/2013-08-28/07206745076.shtml';
$http = new HttpFsockopen($url);
$http->setHeader('Connection:close');//请求完成关闭连接,提高速度
echo $http->get();

/*
<?

$fp = fsockopen ("en.tanbo.name", 80, $errno, $errstr, 30);

if (!$fp) {

echo "$errstr ($errno) ";

} else {

$msg="GET /getip.php HTTP/1.0 ";

$msg.="Host:en.tanbo.name ";

$msg.="Referer: http://en.tanbo.name/getip.php ";

$msg.="Client-IP: 202.101.201.11 ";

$msg.="X-Forwarded-For: 202.101.201.11 "; //主要是这里来构造IP

$msg.="Connection: Close ";

fputs ($fp, $msg);

while (!feof($fp)) {

echo fgets ($fp,1024);

}

fclose ($fp);

}

?>
*/

?>