PHP FILES

<form method="POST" enctype="multipart/form-data">
    <input type="file" name ='file'/>
    <input type="submit" value="Submit" />
</form>
<?php
    if(isset($_FILES['file'])){
        $tmpPath = realpath($_FILES['file']['tmp_name']);
        if($tmpPath){
            $wFile = fopen('./'.date('H-i-s').'.'.pathinfo($_FILES['file']['name'])['extension'], 'w');
            $handler = fopen($tmpPath, 'r');
                $data = fread($handler, filesize($tmpPath));
                fwrite($wFile, $data);
            fclose($handler);
            fclose($wFile);
            if($wFile){
                echo 'File is uploaded!';
            }
            else {
                echo 'Error';
            }
        }
    }