php post请求和jquery中post请求有什么不同吗？该如何处理

php post请求和jquery中post请求有什么不同吗？
自己写了一个php的socket http请求，

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->public function sendpost($postType='POST')    {        $url = $this->postURL;        $data = $this->postData == '' ? array() : $this->postData;        //先解析url        $url = parse_url($url);        $url_port = !isset($url['port']) ? (($url['scheme'] == 'http') ? 80 : 443) : $url['port'];        if (!$url)        {            $this->errMessage = "couldn't parse url";            return false;        }        //将参数拼成URL key1=value1&key2=value2 的形式        $encoded = "";        while (list($k, $v) = each($data))        {            $encoded .= ($encoded ? '&' : '');            $encoded .= rawurlencode($k)."=".rawurlencode($v);        }        //echo $encoded;exit;        $len = strlen($encoded);        //拼上http头        $out = "{$postType} ".$url['path'].(isset($url['query']) ? ('?'.$url['query']) : '')." HTTP/1.1\r\n";        $out .= "Host:".$url['host']."\r\n";        $out .= "Content-type: application/x-www-form-urlencoded\r\n";        $out .= "Connection: Close\r\n";        $out .= "Content-Length: $len\r\n";        $out .= "\r\n";        $out .= $encoded."\r\n";        //打开一个sock        $fp = @fsockopen($url['host'], $url_port);        $line = "";        if (!$fp)        {            $this->errMessage = "$errstr($errno)\n";            return false;        }        else        {            fwrite($fp,$out);            while (!feof($fp))            {                $line .= fgets($fp, 2048);            }        }        //去掉头文件        if ($line)        {            $body = stristr($line, "\r\n\r\n");            $body =substr($body, 4, strlen($body));            $line = $body;        }        fclose($fp);        return $line;    }

同时，用jquery的ajax请求测试。

JScript code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->$.ajax({                    type : "POST",                    cache : false,                    url : _url,                    data : _data,                    dataType : 'json',                    success : function(data) {                                            }                });

发现php的请求总是返回错误的信息，而ajax请求则返回正确的，应该都是http post请求数据返回数据，没什么区别吧。
服务器端还可以检测出是ajax请求还是php请求？

------解决方案--------------------

PHP code

[User:root Time:03:17:09 Path:/home/apache/web]$ cat test.php <?php // http only, no error check.function post_request($url, $data) {        $post_data = http_build_query($data);        $request = "POST /main.php HTTP/1.1\r\n" .                            "Host: 192.168.1.10\r\n" .                           "Content-Type: application/x-www-form-urlencoded\r\n" .                           "Content-Length: " . strlen($post_data) . "\r\n\r\n" .                           $post_data;        echo $request . PHP_EOL;        $sockfd = fsockopen("192.168.1.10", 80);        fwrite($sockfd, $request);        $response = "";        while (($ret= fgets($sockfd)) !== false) {                $response .= $ret;        }        return $response;}$response = post_request("http://192.168.1.10/main.php", array('a' => "baidu", 'b' => "client backend"));echo $response;?>[User:root Time:03:17:12 Path:/home/apache/web]$ cat main.php <?phpecho $_POST['a'] . PHP_EOL;echo $_POST['b'] . PHP_EOL;?><br><font color="#e78608">------解决方案--------------------</font><br>另外，https你的代码是无力的，必须用php支持的context参数利用stream_context_create配合file_get_contents之类的使用或者fopen之类的使用，或者直接用curl。<div class="clear">
                 
              
              
        
            </div>