to remove new line characters from a DOS file

includes/signup.php

@@ -12,6 +12,9 @@ $tv               = $_GET['tv'];
 // username passed lowercased
 $username = strtolower($username);
 
+// strip new line characters from the end
+$pubkey = trim($pubkey);
+
 $from 		  = 'From: www-data <[email protected]>';
 $destination_addr = "[email protected]";
 $subject          = "New User Registration";