Convert a binary data received from stream_socket_recvfrom to string

Question

Trying to convert binary data over websocket back to the string:

An example of code:

public function start() {
        
        while (true) {
    
            $newSocketArray = $this->clientSocketArray;
            stream_select($newSocketArray, $null, $null, 0, 10);
                    
            if (in_array($this->socket, $newSocketArray)) {
                
                $newSocket                  = stream_socket_accept($this->socket);
                $this->clientSocketArray[]  = $newSocket;
                        
                $this->handshake(fread($newSocket, 1024), $newSocket);
                
                echo PHP_EOL . 'New Connection Accepted...' . stream_socket_get_name($newSocket, true); 
                
                $newSocketIndex = array_search($this->socket, $newSocketArray);
                unset($newSocketArray[$newSocketIndex]);
            }
                
            sleep(1);
            $data   = json_decode(file_get_contents('https://min-api.cryptocompare.com/data/price?fsym=BTC&tsyms=USD'));
            $msg    = json_encode(['time' => time(), 'data' => $data]);
            $this->send($msg);
            
            
            foreach ($newSocketArray as $newSocketArrayResource) {
                
                $in  = '';
                
                for(;;) {
                    
                    $buf = stream_socket_recvfrom($newSocketArrayResource, 1024);
                    
                    if ($buf==="" || $buf === false){
                        break;
                    } 
                    
                    $in.=$buf;

                    if (!empty($in) && stream_socket_get_name($newSocketArrayResource, true)) {
                        echo PHP_EOL . 'Regular: '  . $in;
                        echo PHP_EOL . 'Unseal: '   . $this->unseal($in);
                    }
                }
            } 
        }

        fclose($this->server);
}

public function unseal($socketData) {
        
        $length = ord($socketData[1]) & 127;
        if($length == 126) {
                $masks = substr($socketData, 4, 4);
                $data = substr($socketData, 8);
        }
        elseif($length == 127) {
            $masks = substr($socketData, 10, 4);
            $data = substr($socketData, 14);
        }
        else {
            $masks = substr($socketData, 2, 4);
            $data = substr($socketData, 6);
        }
        $socketData = "";
        for ($i = 0; $i < strlen($data); ++$i) {
            $socketData .= $data[$i] ^ $masks[$i%4];
        }
        return $socketData;
    }

public function seal($socketData) {
        
        $b1 = 0x80 | (0x1 & 0x0f);
        $length = strlen($socketData);
        if($length <= 125)
            $header = pack('CC', $b1, $length);
        elseif($length > 125 && $length < 65536)
            $header = pack('CCn', $b1, 126, $length);
        elseif($length >= 65536)
            $header = pack('CCNN', $b1, 127, $length);
        return $header.$socketData;
    }

Thanks.

Updated – hanshenrik

Results: