Allow to use where () without value parameter

MysqliDb.php

@@ -307,7 +307,7 @@ class MysqliDb
      *
      * @return MysqliDb
      */
-    public function where($whereProp, $whereValue)
+    public function where($whereProp, $whereValue = null)
     {
         $this->_where[$whereProp] = Array ("AND", $whereValue);
         return $this;
@@ -323,7 +323,7 @@ class MysqliDb
      *
      * @return MysqliDb
      */
-    public function orWhere($whereProp, $whereValue)
+    public function orWhere($whereProp, $whereValue = null)
     {
         $this->_where[$whereProp] = Array ("OR", $whereValue);
         return $this;
@@ -582,6 +582,8 @@ class MysqliDb
                             $comparison = ' '.$key.' ? ';
                             $this->_bindParam ($val);
                     }
+                } else if ($value[1] == null) {
+                    $comparison = '';
                 } else {
                     $comparison = ' = ? ';
                     $this->_bindParam ($value[1]);

readme.md

@@ -127,13 +127,6 @@ $results = $db->get('users');
 // Gives: SELECT * FROM users WHERE id=1 AND login='admin';
 ```
 
-Custom Operators:
-```php
-$db->where("id = ? or id = ?", Array(6,2));
-$res = $db->get ("users");
-// Gives: SELECT * FROM users WERE id = 2 or id = 2;
-```
-
 ```php
 $db->where('id', Array('>=' => 50));
 $results = $db->get('users');
@@ -171,6 +164,20 @@ $results = $db->get("users");
 // Gives: SELECT * FROM users where lastName <=> NULL
 ```
 
+Also you can use raw where conditions:
+```php
+$db->where ("id != companyId");
+$results = $db->get("users");
+```
+
+Or raw condition with variables:
+```php
+$db->where("id = ? or id = ?", Array(6,2));
+$res = $db->get ("users");
+// Gives: SELECT * FROM users WERE id = 2 or id = 2;
+```
+
+
 Optionally you can use method chaining to call where multiple times without referencing your object over an over:
 
 ```php