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。 

<?php

class SOCKET_UPLOAD

{

    private $host = '127.0.0.1';

    private $port = 80;

    private $errno = null;

    private $errstr = null;

    public $timeout = 30;

    public $url = '/socket/socketupload/upload.php';//请求地址

    private $fp = null;

    private $header = '';  //头信息

    private $body = '';    //消息体

    private $boundary = '----abcdefg'; //指定分隔符号的标志

    private $res = null;  //完整字符串

    private $file = null; //文件

    private $form = null; //表单

    public function __construct($form ='',$file='')

    {

        //连接本地80端口

        $this->fp = fsockopen($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();

<?php

defined('UPLOAD') or define('UPLOAD',dirname(__FILE__).'/upload');

if ($_FILES['file']['error'] == 0){

    $name = $_POST['name'];

    $age  = $_POST['age'];

    echo 'name is:',$name,"<br/>age is:",$age."<br/>";

    $file = $_FILES['file'];

    $ext = strrchr($file['name'],'.');

    $filename = $_SERVER["REQUEST_TIME"].$ext;

    if (move_uploaded_file($file['tmp_name'],UPLOAD.'/'.$filename)) {

        echo '<img src="upload/'.$filename.'">';

    }

}