主要就是利用php 的 fsocketopen 消息传输。 这里先通过upload.html 文件提交，利用chrome抓包，可以看到几个关键的信息。

首先指定了表单类型为multipart/form-data;。 boundary是分隔符 因为上传文件不在使用原有的http协议了。请求内容不再可能以 x = y方式发送了。而使用了 分隔符 字段内容 分隔符号 字段内容2 而boundary就是指定分隔符号的标志。 请求的内容就应该是这样的了。

在来看下消息体

　

＃socket_upload.php 　拼接http上传协议格式 post请求　

     fp = fsockopen($this->host,$this->port,$this->errno,$this->errstr,$this->timeout);        if (!$this->fp)            exit('failed');        //赋值        $this->form = $form;        $this->file = $file;        //设置头信息，消息体        $this->setHead();        $this->setBody();        //拼接整个请求信息        $this->getStr();    }    public function write()    {        //echo $this->res;        //写入        fwrite($this->fp, $this->res);        //打印输出信息        $response = '';        while($row=fread($this->fp, 4096)){            $response .= $row;        }        fclose($this->fp);        $pos = strpos($response, "\r\n\r\n");        $response = substr($response, $pos+4);        echo $response;    }    private function getStr()    {        $this->header .= "Content-Length:".strlen($this->body)."\r\n";        $this->header .= "Connection: close\r\n\r\n";        $this->res = $this->header.$this->body;    }    //设置头信息    private function setHead()    {        $this->header .= "POST {
   $this->url} HTTP/1.1\r\n";        $this->header .= "HOST:{
   $this->host} \r\n";        $this->header .= "Content-Type:multipart/form-data;  boundary={
   $this->boundary}\r\n";    }    //设置消息体    private function setBody()    {        $this->form();        $this->file();    }    //非文件表单    private function form()    {        if ($this->form && is_array($this->form))        {            foreach ($this->form as $key=>$val)            {                $this->body .= "--$this->boundary"."\r\n";                $this->body .= "Content-Disposition: form-data; name=\"{
   $key}\"\r\n";                $this->body .= "Content-type:text/plain\r\n\r\n";                $this->body .= "{
   $val}\r\n";            }        }    }    //文件表单    private function file()    {        if ($this->file && is_array($this->file))        {            foreach ($this->file as $key=>$val)            {                $this->body .= "--$this->boundary"."\r\n";                $this->body .= "Content-Disposition: form-data; name=\"{
   $val['name']}\"; filename=\"{
   $val['filename']}\"\r\n";                $this->body .= "Content-Type: {
   $val['type']}\r\n\r\n";                $this->body .= file_get_contents($val['path'])."\r\n";                $this->body .= "--{
   $this->boundary}";            }        }    }}$form = [    'name'=>'lemon',    'age'=>'12'];$file = [    [        'name'=>'file',        'filename'=>'a.jpg',        'path'=>'a.jpg',        'type'=>'image/jpeg',    ]];$upload = new SOCKET_UPLOAD($form,$file);$upload->write();

#接收post请求并保存图片代码

     age is:",$age."
";        $file = $_FILES['file'];    $ext = strrchr($file['name'],'.');    $filename = $_SERVER["REQUEST_TIME"].$ext;    if (move_uploaded_file($file['tmp_name'],UPLOAD.'/'.$filename)) {        echo '';    }}

范例代码：http://files.cnblogs.com/files/loveyouyou616/socket.zip