Helper\Mailer\Smtp::socket PHP Method

    protected function socket()
    {
        //创建socket资源
        $this->_socket = socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp'));
        if (!$this->_socket) {
            $this->_errorMessage = socket_strerror(socket_last_error());
            return false;
        }
        socket_set_block($this->_socket);
        //设置阻塞模式
        //连接服务器
        if (!socket_connect($this->_socket, $this->_sendServer, $this->_port)) {
            $this->_errorMessage = socket_strerror(socket_last_error());
            return false;
        }
        $str = socket_read($this->_socket, 1024);
        if (!preg_match("/220+?/", $str)) {
            $this->_errorMessage = $str;
            return false;
        }
        return true;
    }