How secure is this?

[ryanfilard]

I wrote an update script, how secure do you think it is?

By the way, this is an include. The page it is included on stop attacks by making sure the user is logged in.

function update_file($url, $file)
{
        //Get URL content
		$ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
            $data = curl_exec($ch);
            curl_close($ch);
            $new_content = $data;

		//Replace with content from URL
		file_put_contents($file, $new_content);
		echo $new_content;
}

function get_url($file)
{

$domain = 'http://www.mysite.com/';
$folder = 'update/'; 
$ver = '2.0.1';	
$full_url = ''.$domain.''.$folder.'/'.$ver.'/';
$fileu = array
(
"functions/update.php" => "".$full_url."functions/update.txt"
);

return $fileu[$file];
}

$files = array
(
'functions/update.php'
);

foreach($files as $file)
{
update_file(get_url($file),$file);
}