php renaming (unknown) uploaded file extension

Question

hi guys i have to rename the (unknown) uploaded file extension from .MP3 to .zip please help I have been stuck with this for a few days now. Thanks in advance:)

if (!copy($file, $newfile)) {
    echo "failed to copy $file...\n";
}
$filename = "members/$id/music" . "/" . $_FILES["file"]["name"];
    function replace_extension($filename, $zip) {
    return preg_replace('/\..+$/', '.' . $zip, $filename);
}

Answer 1

Use this instead:

function replace_extension($file, $new_extension) {
    $t = pathinfo($file);
    unset($t["basename"]);
    unset($t["extension"]);
    return implode(DIRECTORY_SEPARATOR, $t) . "." . $new_extension;
}

Answer 2

If you need to add .zip, does this mean you need to actually compress the file too? Just ading the .zip extension will not make it a valid zip file. You may want to have a look at: http://www.php.net/manual/en/function.ziparchive-addfile.php

$zip = new ZipArchive;
if ($zip->open('test.zip') === TRUE) {
    $zip->addFile('/path/to/index.txt', 'newname.txt');
    $zip->close();
    echo 'ok';
} else {
    echo 'failed';
}