PHP file upload with extension and size check

if($_FILES['image']['name'] != '')
{
	$filename = preg_replace('/[^a-zA-Z0-9._-]/', '', $_FILES['image']['name']);
	$ext = substr($filename, strpos($filename,'.'), strlen($filename)-1);
 
	if (! preg_match('/\.(jpg|gif|png)/i', $ext))
		echo 'Filetype not supported.';
 
	if ($_FILES['image']['size'] > 1000000)
		echo 'File size too high, 1MB is allowed.';
 
	move_uploaded_file($_FILES['image']['tmp_name'], PATH . '/'.$filename);
}