Could not decode a text frame as UTF-8.

PHP Snippet 1:

socket_write($socket, encode($answer));
function encode($text) {
    $b1 = 0x80 | (0x1 & 0x0f);
    $length = strlen($text);
    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 $header.$text;
}