<?php
function request_by_fsockopen($url,$post_data=array(),$debug=false){
  $url_array = parse_url($url);
  $hostname = $url_array['host'];
  $port = isset($url_array['port'])? $url_array['port'] : 80;
  @$requestPath = $url_array['path'] ."?". $url_array['query'];
  $fp = fsockopen($hostname, $port, $errno, $errstr, 10);
  if (!$fp) {
    echo "$errstr ($errno)";
    return false;
  }
  $method = "GET";
  if(!empty($post_data)){
    $method = "POST";
  }
  $header = "$method $requestPath HTTP/1.1\r\n";
  $header.="Host: $hostname\r\n";
  if(!empty($post_data)){
    $_post = strval(NULL);
    foreach($post_data as $k => $v){
    $_post[]= $k."=".urlencode($v);//必须做url转码以防模拟post提交的数据中有&符而导致post参数键值对紊乱
    }
    $_post = implode('&', $_post);
    $header .= "Content-Type: application/x-www-form-urlencoded\r\n";//POST数据
    $header .= "Content-Length: ". strlen($_post) ."\r\n";//POST数据的长度
    $header.="Connection: Close\r\n\r\n";//长连接关闭
    $header .= $_post; //传递POST数据
  }else{
    $header.="Connection: Close\r\n\r\n";//长连接关闭
  }
  fwrite($fp, $header);
  //-----------------调试代码区间-----------------
  //注如果开启下面的注释,异步将不生效可是方便调试
  if($debug){
  $html = '';
  while (!feof($fp)) {
  $html.=fgets($fp);
  }
  echo $html;
  }
  //-----------------调试代码区间-----------------
  fclose($fp);
}
$data=array('name'=>'guoyu','pwd'=>'123456');
$url='http://localhost/test/other.php';
request_by_fsockopen($url,$data,true);//

<?php
header("content-type:text/html;charset=utf-8");
//error_reporting(0);
//ini_set('html_errors',false);
//ini_set('display_errors',false);
$name = isset($_POST['name'])?$_POST['name']:'';
$pwd = isset($_POST['pwd'])?$_POST['pwd']:'';
echo $name.$pwd;
echo 'success ok';
die;
?>

$data=array('name'=>'guoyu','pwd'=>'123456');
$url='http://localhost/test/other.php';
request_by_fsockopen($url,$data,true);//把应用B的用户表异步-同步数据