Added two new function: user_exsist_by_id() and user_exsist_by_email()

README.md

@@ -164,6 +164,25 @@ sorry John you will be banned :(
 ```php
 $this->aauth->ban_user(3);
 ``` 
+
+You can check if the user exists in the database based on the user's email address
+
+```php
+if($this->aauth->user_exsist_by_email('user@domain.tld')){
+//user exsist
+}else{
+//user not exsist
+}
+```
+or user id
+
+```php
+if($this->aauth->user_exsist_by_id(3)){
+//user exsist
+}else{
+//user not exsist
+}
+```
 
 Quick Start is done but thats not the end  
 Take a look [detailed Documentation from wiki](https://github.com/emreakay/CodeIgniter-Aauth/wiki/_pages)   

application/libraries/Aauth.php

@@ -803,6 +803,42 @@ public function is_banned($user_id) {
             return FALSE;
     }
 
+    /**
+     * user_exsist_by_id
+     * Check if user exist by user id
+     * @param $user_id
+     *
+     * @return bool
+     */
+    public function user_exsist_by_id( $user_id ) {
+        $query = $this->CI->db->where('id', $user_id);
+
+        $query = $this->CI->db->get($this->config_vars['users']);
+
+        if ($query->num_rows() > 0)
+            return TRUE;
+        else
+            return FALSE;
+    }
+
+    /**
+     * user_exsist_by_email
+     * Check if user exsist by user email
+     * @param $user_email
+     *
+     * @return bool
+     */
+    public function user_exsist_by_email( $user_email ) {
+        $query = $this->CI->db->where('email', $user_email);
+
+        $query = $this->CI->db->get($this->config_vars['users']);
+
+        if ($query->num_rows() > 0)
+            return TRUE;
+        else
+            return FALSE;
+    }
+
     /**
      * Get user id
      * Get user id from email address, if par. not given, return current user's id