fix: use random_int() in random_string('numeric')

Author: kenjis

system/Helpers/text_helper.php

@@ -543,7 +543,6 @@ function random_string(string $type = 'alnum', int $len = 8): string
     {
         switch ($type) {
             case 'alnum':
-            case 'numeric':
             case 'nozero':
             case 'alpha':
                 switch ($type) {
@@ -555,17 +554,19 @@ function random_string(string $type = 'alnum', int $len = 8): string
                         $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
                         break;
 
-                    case 'numeric':
-                        $pool = '0123456789';
-                        break;
-
                     case 'nozero':
                         $pool = '123456789';
                         break;
                 }
 
                 return substr(str_shuffle(str_repeat($pool, (int) ceil($len / strlen($pool)))), 0, $len);
 
+            case 'numeric':
+                $max  = 10 ** $len - 1;
+                $rand = random_int(0, $max);
+
+                return sprintf('%0' . $len . 'd', $rand);
+
             case 'md5':
                 return md5(uniqid((string) mt_rand(), true));