php发送post请求的三种方法讲解

    public static function post($url, $post_data = '', $timeout = 5){//curl

        $ch = curl_init();

        curl_setopt ($ch, CURLOPT_URL, $url);

        curl_setopt ($ch, CURLOPT_POST, 1);

        if($post_data != ''){

            curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);

        }

        curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);

        curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);

        curl_setopt($ch, CURLOPT_HEADER, false);

        $file_contents = curl_exec($ch);

        curl_close($ch);

        return $file_contents;

    }

    public static function post2($url, $data){//file_get_content

        $postdata = http_build_query(

            $data

        );

        $opts = array('http' =>

                      array(

                          'method'  => 'POST',

                          'header'  => 'Content-type: application/x-www-form-urlencoded',

                          'content' => $postdata

                      )

        );

        $context = stream_context_create($opts);

        $result = file_get_contents($url, false, $context);

        return $result;

    }

    public static function post3($host,$path,$query,$others=''){//fsocket

        $post="POST $path HTTP/1.1rnHost: $hostrn";

        $post.="Content-type: application/x-www-form-";

        $post.="urlencodedrn${others}";

        $post.="User-Agent: Mozilla 4.0rnContent-length: ";

        $post.=strlen($query)."rnConnection: closernrn$query";

        $h=fsockopen($host,80);

        fwrite($h,$post);

        for($a=0,$r='';!$a;){

                $b=fread($h,8192);

                $r.=$b;

                $a=(($b=='')?1:0);

            }

        fclose($h);

        return $r;

    }
}