php 利用http上传协议(表单提交上传图片 )

　　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　

<?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();

#接收post请求并保存图片代码

<?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.'">';}}