Add RAND () orderBy value

Author: avbdr

MysqliDb.php

@@ -794,8 +794,12 @@ protected function _buildOrderBy () {
             return;
 
         $this->_query .= " ORDER BY ";
-        foreach ($this->_orderBy as $prop => $value)
-            $this->_query .= $prop . " " . $value . ", ";
+        foreach ($this->_orderBy as $prop => $value) {
+            if (strtolower (str_replace (" ", "", $prop)) == 'rand()')
+                $this->_query .= "rand(), ";
+            else
+                $this->_query .= $prop . " " . $value . ", ";
+        }
 
         $this->_query = rtrim ($this->_query, ', ') . " ";
     }

readme.md

@@ -254,8 +254,9 @@ $results = $db
 ```php
 $db->orderBy("id","asc");
 $db->orderBy("login","Desc");
+$db->orderBy("RAND ()");
 $results = $db->get('users');
-// Gives: SELECT * FROM users ORDER BY id ASC,login DESC;
+// Gives: SELECT * FROM users ORDER BY id ASC,login DESC, RAND ();
 ```
 
 ### Grouping method