Update function random_string

Author: hungnguyenhp

system/helpers/string_helper.php

@@ -198,42 +198,81 @@ function reduce_multiples($str, $character = ',', $trim = FALSE)
 	/**
 	 * Create a "Random" String
 	 *
-	 * @param	string	type of random string.  basic, alpha, alnum, numeric, nozero, unique, md5, encrypt and sha1
-	 * @param	int	number of characters
-	 * @return	string
+	 * Function update by FuelPHP
+	 *
+	 * @param	string $type	type of random string.  basic, alpha, alnum, numeric, nozero, unique, md5, encrypt and sha1
+	 * @param	int $length	number of characters
+	 * @return	string  the random string
 	 */
-	function random_string($type = 'alnum', $len = 8)
+	function random_string($type = 'alnum', $length = 16)
 	{
-		switch ($type)
-		{
+		switch ($type) {
 			case 'basic':
 				return mt_rand();
+				break;
+
+			default:
 			case 'alnum':
 			case 'numeric':
 			case 'nozero':
 			case 'alpha':
-				switch ($type)
-				{
+			case 'distinct':
+			case 'hexdec':
+				switch ($type) {
 					case 'alpha':
 						$pool = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
 						break;
+
+					default:
 					case 'alnum':
 						$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
 						break;
+
 					case 'numeric':
 						$pool = '0123456789';
 						break;
+
 					case 'nozero':
 						$pool = '123456789';
 						break;
+
+					case 'distinct':
+						$pool = '2345679ACDEFHJKLMNPRSTUVWXYZ';
+						break;
+
+					case 'hexdec':
+						$pool = '0123456789abcdef';
+						break;
 				}
-				return substr(str_shuffle(str_repeat($pool, ceil($len / strlen($pool)))), 0, $len);
-			case 'unique': // todo: remove in 3.1+
+
+				$str = '';
+				for ($i = 0; $i < $length; $i++) {
+					$str .= substr($pool, mt_rand(0, strlen($pool) - 1), 1);
+				}
+
+				return $str;
+				break;
+
 			case 'md5':
-				return md5(uniqid(mt_rand()));
-			case 'encrypt': // todo: remove in 3.1+
-			case 'sha1':
-				return sha1(uniqid(mt_rand(), TRUE));
+			case 'unique':
+				return md5(uniqid(mt_rand(), true));
+				break;
+
+			case 'sha1' :
+				return sha1(uniqid(mt_rand(), true));
+				break;
+
+			case 'uuid':
+				$pool = array('8', '9', 'a', 'b');
+
+				return sprintf('%s-%s-4%s-%s%s-%s',
+							   random_string('hexdec', 8),
+							   random_string('hexdec', 4),
+							   random_string('hexdec', 3),
+							   $pool[array_rand($pool)],
+							   random_string('hexdec', 3),
+							   random_string('hexdec', 12));
+				break;
 		}
 	}
 }