php中连接tcp服务的三种方式

<?php
/**
* Http 服务器类
*/
class Http{
    private $host;
    private $port;
    private $_root;

    public $mime_types = array(
        'avi' => 'video/x-msvideo',
        'bmp' => 'image/bmp',
        'css' => 'text/css',
        'doc' => 'application/msword',
        'gif' => 'image/gif',
        'htm' => 'text/html',
        'html' => 'text/html',
        'ico' => 'image/x-icon',
        'jpe' => 'image/jpeg',
        'jpeg' => 'image/jpeg',
        'jpg' => 'image/jpeg',
        'js' => 'application/x-javascript',
        'mpeg' => 'video/mpeg',
        'ogg' => 'application/ogg',
        'png' => 'image/png',
        'rtf' => 'text/rtf',
        'rtx' => 'text/richtext',
        'swf' => 'application/x-shockwave-flash',
        'wav' => 'audio/x-wav',
        'wbmp' => 'image/vnd.wap.wbmp',
        'zip' => 'application/zip',
      );

    /**
     * @param string $host 监听地址
     * @param int $port 监听端口
     * @param string $_root 网站根目录
    */
    public function __construct($host,$port,$_root){
        $this->host = $host;
        $this->port = $port;
        $this->_root = $_root;
    }

    /**
    * 启动http服务
    */
    public function start(){
        //创建socket套接字
        $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
        //设置阻塞模式
        socket_set_block($socket);
        //为套接字绑定ip和端口
        socket_bind($socket,$this->host,$this->port);
        //监听socket
        socket_listen($socket,4);

        while(true)
        {
            //接收客户端请求
            if(($msgsocket = socket_accept($socket)) !== false){
                //读取请求内容
                $buf = socket_read($msgsocket, 9024);
                
                preg_match("/\/(.*) HTTP\/1\.1/",$buf,$matchs);
                
                preg_match("/Accept: (.*?),/",$buf,$matchss);
                //获取接收文件类型
                $type = explode("/",$matchss[1])[0];

                if($type=="text"){
                    $content = $this->GetString($matchs[1]);
                }else{
                    $content = $this->GetImg($matchs[1]);
                }

                socket_write($msgsocket,$content,strlen($content));

                socket_close($msgsocket);
            }
        }
    }

    /**
     * 组装消息头信息模板
     * @param int $code 状态码
     * @param string $status 状态名称
     * @param string $content 发送的文本内容
     * @param string $content_type 发送的内容类型
     * @return string
    **/
    public function GetHeaders($code,$status,$content="",$content_type="text/html;charset=utf-8"){
        $header = '';
        $header .= "HTTP/1.1 {$code} {$status}\r\n";
        $header .= "Date: ".gmdate('D, d M Y H:i:s T')."\r\n";
        $header .= "Content-Type: {$content_type}\r\n";
        $header .= "Content-Length: ".strlen($content)."\r\n\r\n";//必须2个\r\n表示头部信息结束
        $header .= $content;
        return $header;
    }

    /**
    * 组装文本发送信息
     * @param string $url_path
     * @return string
    **/
    public function GetString($url_path){
        if($this->getRealPath($url_path)){
            if(is_readable($this->getRealPath($url_path))){
                return $this->GetHeaders(200,"OK",file_get_contents($this->getRealPath($url_path)),$this->getMime($url_path));
            }else{
                return $this->GetHeaders(401,"Unauthorized");
            }
            
        }else{
            return $this->GetHeaders(404,"Not Found");
        }
    }

    /**
    * 组装资源返回信息
     * @param string $url_path
     * @return string
    **/
    public function GetImg($url_path){
        if($this->getRealPath($url_path)){

            return $this->GetHeaders(200,"OK",file_get_contents($this->getRealPath($url_path)),$this->getMime($url_path));
        }else{
           return $this->GetHeaders(404,"Not Found");
        }
    }

    /**
     * 获取资源类型
     * @param string $path
     * @return mixed
     */
    public function getMime($path){
       $type = explode(".",$path);
       $mime = $this-> mime_types[$type[1]]; 
       return $mime;
    }

    /**
     * 获取访问资源的真实地址
     * @param $url_path
     * @return bool|string
     */
    public function getRealPath($url_path){
        return realpath($this->_root."/".$url_path);
    }

}

$server = new Http("127.0.0.1",3046,"wwwroot");
$server->start();