ZipArchive::setArchiveComment

Please note that ZIP archives do not support unicode encodings like UTF-8, so multi-byte characters cannot be shown in standard ZIP viewers like WinRAR or 7-zip. However, the text will stored as-is, so it is at least possible to display UTF-8 comments in your own desktop or web applications. If you want to test with PHP and output in a browser, don't forget to set page charset to UTF-8 too:header("Content-Type: text/plain; charset=utf-8");

Zip archives are encoded in ISO-8859-1 when stored but comments seem to be added in UTF-8 everytime. So...<?php   $zip->setArchiveComment("Peña");    //outputs "Peña" as the comment.   $zip->setArchiveComment("Peña");    //outputs "NULL" as the comment / no comment is displayed.?>Using mb_internal_encoding() or mb_http_output() wont change this behavior.At the end you can fix your corrupted comment using something like str_replace();Consider this:<?php$zip = new ZipArchive;$res = $zip->open('test.zip', ZipArchive::CREATE);if ($res === TRUE) {    $zip->addFromString('test.txt', 'file content goes here');    $zip->setArchiveComment('Peña'); //outputs "Peña" as the comment.    $zip->close();    $file = file_get_contents('test.zip');    file_put_contents('test.zip', str_replace("Peña", utf8_decode("Peña"), $file)); //outputs "Peña" as the comment. FIXED!    echo 'ok';} else {    echo 'failed';}?>

ZipArchive (using libzip) encodes comments in UTF-8/ASCII, but some softwares on Windows show comments in ANSI (such as GBK...), so we should :<?php    $_charset = 'GBK';    $file = 'D:/boaphp.zip';    $comment = '中文ABC123';        $zip = new ZipArchive;    $res = $zip->open($file, ZipArchive::CREATE);    if ($res) {        //add files here        if($_charset){ //for Winrar, 7z...            $zip->close();                        $str = mb_convert_encoding($comment, $_charset, 'UTF-8');            $fh = fopen($file, 'r+b');            fseek($fh, -2, SEEK_END);            $str = pack('v', strlen($str)) . $str;            fwrite($fh, $str);            fclose($fh);        }else{ //for PHP: $zip->getArchiveComment()            $zip->setArchiveComment($comment);            $zip->close();        }    }?>