/*
	- Username validator
	- Ensures a username entered on registration meets specific requirements. 
	- If it returns 0 that means it passed
	- If it returns 1 that means the username contains less than the min characters
	- If it returns 2 that means the username contains more than the max characters
	- If it returns 3 that means the username contains whitespaces (when not permitted)
	- If it returns 4 that means the username contains special characters (when not permitted)
	- If it returns 5 that means the username contains numbers (when not permitted)
	
	$username          - The username to be validated
	$minChars          - Minimum amount of characters permitted in the username
	$maxChars          - Maximum amount of characters permitted in the username
	$whiteSpaces       - Can the username contain whitespaces?
	$specialCharacters - Can the username contain special characters? (eg. !"£$%^)
	$numbers           - Can the username contain numbers?
	*/
	
	public function validateUsername($username, $minChars = 3, $maxChars = 20, $whiteSpaces = false, $specialCharacters = false, $numbers = true) {
		$valid = 0;
		
		if (strlen($username) < $minChars)
			$valid = 1;
		elseif (strlen($username) > $maxChars)
			$valid = 2;
		elseif (preg_match("/\s/", $username) && !$whiteSpaces)
			$valid = 3;
		elseif (!preg_match("#^[a-zA-Z0-9]+$#", $username) && !$specialCharacters)
			$valid = 4;
		elseif (preg_match("([0-9])", $username) && !$numbers)
			$valid = 5;
		
		return $valid;
	}