原理
PHP利用socket进行文件上传，欲知其原理，首先需要知悉上传时的请求信息，请求信息包含请求头和请求体。通常情况下，PHP通过表单上传文件时，CHROME抓取到的信息如图
根据具体的请求信息，便可以进行请求
请求头和请求体的拼装,继而通过fsock一系列socket文件处理从而达到和表单上传一样的效果。
核心代码
class SOCKET_UPLOAD{
private $host="127.0.0.1";
private $port=80;
private $errno=null;
private $errstr=null;
public $timeout=30;
public $url="/upload/handle.php";
private $ch=null;
private $header="";
private $body="";
private $boundary='----avcss';
private $res=null;
private $file=null;
private $form=null;
public function __construct($form='',$file=''){
$this->ch = fsockopen($this->host,$this->port,$this->errno,$this->errstr,$this->timeout);
if(!$this->ch) exit('connect error!');
$this->form=$form;
$this->file=$file;
$this->setHead();
$this->setBody();
var_dump($this->body);
$this->getStr();
}
/*写入请求信息，并获得相应信息*/
public function write(){
fwrite($this->ch,$this->res);
$response = '';
while($row=fread($this->ch,4096)){
$response .= $row;
}
fclose($this->ch);
// var_dump($response);
$pos = strpos($response, "\r\n\r\n");
$response = substr($response,$pos+4);
echo $response;
}
/*请求信息拼装完成*/
public 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;
}
/*请求头拼装*/
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";
}
private function setBody(){
$this->form();
$this->file();
}
/*请求体表单字段拼装*/
private function form(){
if($this->form && is_array($this->form)){
foreach($this->form as $k=>$v){
$this->body .= "--$this->boundary"."\r\n";
$this->body .= "Content-Disposition:form-data;name=\"{$k}\"\r\n";
$this->body .= "Content-type:text/plain\r\n\r\n";
$this->body .= "{$v}\r\n";
}
}
}
/*请求体文件拼装*/
private function file(){
if($this->file && is_array($this->file)){
foreach($this->file as $k=>$val){
// var_dump($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}";
}
}
}
}
