Add password on Zip via PHP

what does not work with that solution?
which OS is the webserver running?

i am running on windows. I i am installed WAMP server on windows VISTA

zip must be in the PATH and the webserver must be able to write to the directory where WAMP is running.
Check your permissions and pathes.

well, i am doing like that:
And it creates .zip file, but do not add password :/

$zip = new ZipArchive();
$filename = $username.'-'.$date.'-'.$random.'.zip';
 
if ($zip->open($filename, ZIPARCHIVE::CREATE)!==TRUE) {
}
 
$zip->addFromString($date."-textfile.txt", "Works!\n");
echo system('zip -P bla '.$filename);
$zip->close();

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hm, aha i see now, that i need zip.exe in that dir. But where can i download free version. I tried from http://www.info-zip.org/Zip.html#Win32 . But i dont know which one should i download. I am using windows Vista

thanks, worked!