I've a problem with jQuery uploadify script and I didn't found any solution. I've integrated this script on my project and everything is working fine on a Windows server(localhost) but when I try to run it on an UNIX server and I/O error is risen. This only happens when I try to upload a file that already exists on uploading folder. On Windows the file is overwritten but a UNIX I get and I/O error.

Eğer herhangi bir çözüm varsa çok minnettar olacağım lütfen.

Burada sorun (PHP kodu) olduğunu düşünüyorum sunucu tarafı kodu:

if (!empty($_FILES)) {
    $tempFile = $_FILES['Filedata']['tmp_name'];
    $targetPath = $_SERVER['DOCUMENT_ROOT'].$_REQUEST['folder'].'/';
    $targetFile = str_replace('//', '/', $targetPath).$_FILES['Filedata']['name'];

    if (file_exists($targetFile)) unlink($targetFile);
    copy($tempFile, $targetFile);
    echo "1";
}