PHP Rename files

$log_folder = "logs";
$log_name1 = "logs.txt";
$log_name2 = "logs.txt.old";
$log_name3 = "logs.txt.archive";
if (!(unlink($log_name3))) {
echo "Error deleting $log_name3
";
} else {
echo "$log_name3 deleted successfully
"; }
if (!(rename($log_name2,$log_name3))) {
echo "Error renaming $log_name2 to $log_name3
";
} else {
echo "$log_name2 successfully renamed to $log_name3
";
}
if (!(rename($log_name1,$log_name2))) {
echo "Error renaming $log_name1 to $log_name2
";
} else {
echo "$log_name1 successfully renamed to $log_name2
";
}
if (!(copy($log_folder,$log_name1))) {
echo "Error copying $log_name1 to $log_folder
";
} else {
echo "$log_name1 copied to $log_folder successfully
";
}
?>