handleTextFrame.php

<?php
private function handleTextFrame($frameSize, $raw)
{
    $data = unpack('C1encoding/A' . ($frameSize - 1) . 'information', $raw);
 
    if ($data['encoding'] == 0x00) # ISO-8859-1
        return mb_convert_encoding($data['information'], 'utf-8', 'iso-8859-1');
    else{ # utf-16
        # Fix the missing last char of the info bug
        # Add NUL character at the end of the string. 
        # Don't ask, just enjoy. Idk why it works, but it works!
        $data["information"] .=  chr(0);
        return mb_convert_encoding($data['information'], 'utf-8', 'utf-16');
    }
}