Upload image in php with unique name

$file = $_FILES["file"]["name"];
$imageFileType = strtolower(pathinfo($file,PATHINFO_EXTENSION));
$filenamekey = md5(uniqid($file, true));
$filenamekey12 = $filenamekey.".".$imageFileType;
echo $filenamekey12;
move_uploaded_file($_FILES['file']['tmp_name'],'image/'.$filenamekey12);