PHP socket class

When I have nothing to do, I encapsulate a socket class myself

The function is very simple and the same as the curl function

class socketClass{
    private $host;
    private $url;
    private $error_no = 0;
    public $error_str = '';
    private $port = 80;
    private $timeout = 5;
    private $method;
    private $param;
    private $fp;
    private $content = '';
    private $header = array();
    public function __construct($host, $port, $url, $param, $method='GET', $timeout=5) {
        $this->host = $host;
        $this->port = $port;
        $this->url = $url;
        $this->timeout = $timeout;
        $this->method = $method;
        if(is_array($param)){
            $this->param = http_build_query($param);
        }else{
            $this->param = $param;
        }
    }
    private function connect(){
        $this->fp = fsockopen($this->host, $this->port, $this->error_no, $this->error_str, $this->timeout);
        if(!$this->fp){
            $this->error_str = 'socket connect failed';
            return false;
        }
        return true;
    }
    private function send(){
        $this->fp = '';
        if(!$this->connect()){
            $this->error_str = 'connect socket failed';
            return false;
        }
        if($this->method == 'POST'){
            $header = "POST $this->url HTTP/1.1\r\n";
        }else{
            if(!empty($this->param)){
                $header = "GET $this->url?$this->param HTTP/1.1\r\n";
            }else{
                $header = "GET $this->url HTTP/1.1\r\n";
            }
        }
        $header .= "Content-Length:" . strlen($this->param) . "\r\n";
        $header .= "Host:$this->host:$this->port\r\n";
        $header .= "Content-Type:application/x-www-form-urlencode\r\n";
        $header .= "Connection:close\r\n\r\n";
        if($this->method == 'POST'){
            $header .= "$this->param\r\n\r\n";
        }
        if(!empty($this->header)){
            foreach ($this->header as $key=>$val){
                $header .= "$key:$val\r\n";
            }
        }
        fwrite($this->fp, $header);
        while(!feof($this->fp)){
            $this->content .= fread($this->fp, 1024);
        }
        fclose($this->fp);
        return true;
    }
    public function getContent(){
        if(!$this->send()){
            return false;
        }
        $pos = strpos($this->content, "\r\n\r\n");
        $this->content = substr($this->content, $pos);
        return $this->content;
    }
    public function setHeader($key, $val){
        $this->header[$key] = $val;
    }
    public function getErrorStr(){
        return $this->error_str;
    }
}
$host = 'localhost';
$port = 81;
$url = 'http://localhost/phpdemo/php/socket_accept.php';
$param = array('username'=>'beggar', 'passwd'=>'20060400');
$method = 'GET';
$timeout = 10;
$http = new socketClass($host, $port, $url, $param, $method, $timeout);
$http->setHeader('referer', $url);
$http->setHeader('Accept', '*/*');
$header = $http->getContent();
echo $header;

The above introduces the PHP socket class, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.