diff --git a/src/WhereSql.php b/src/WhereSql.php
new file mode 100644
index 0000000..ffbb5a3
--- /dev/null
+++ b/src/WhereSql.php
@@ -0,0 +1,231 @@
+<?php
+
+namespace PhangoApp\PhaModels;
+
+/**
+* A simple class for create where strings with checking.
+*
+* With this extension, you can create sql strings for use on where parameter of select method from Webmodel.
+*
+* Example ['AND']->array( 'field' => array('!=', 25), 'field2' => array('=', 'value_field'), 'field3' => array('LIKE', 'value_field'), 'field4' => array('IN',  array('1','2','3'), 'limit_sql' => array('LIMIT', array(1, 10), 'order_by' => array('order_fieldY', 'ASC'
+))
+* 
+*You can join differents sql sentences 
+*
+* @warning Phango developers recommend use Webmodel::check_where_sql method on a simple sql string
+*
+*/
+
+class WhereSql {
+
+	public $initial_sql;
+	public $arr_conditions;
+	public $order_by;
+	public $limit;
+
+	public function __construct($model_name, $arr_conditions=array(), $order_by=array(), $limit=array())
+	{
+	
+		$this->model_name=$model_name;
+		$this->initial_sql='WHERE 1=1 ';
+		$this->arr_conditions=$arr_conditions;
+		$this->order_by=$order_by;
+		$this->limit=$limit;
+	
+	}
+	
+	public function get_where_sql()
+	{
+	
+		$arr_to_glued=array();
+		
+		$arr_define_sql=array();
+		
+		$arr_final_sql=array();
+		
+		$first_sep=0;
+		
+		foreach($this->arr_conditions as $group => $arr_glue)
+		{
+		
+			foreach($arr_glue as $glue => $arr_elements)
+			{
+				
+				foreach($arr_elements as $arr_fields_where)
+				{
+					
+					foreach($arr_fields_where as $field => $operation)
+					{
+					
+						
+					
+						list($field_select, $model_name, $field_name)=$this->set_safe_name_field(Webmodel::$model[$this->model_name], $field);
+								
+						$op=$operation[0];
+						
+						$value=$operation[1];
+						
+						switch($op)
+						{
+						
+							case '=':
+							
+								$value=Webmodel::$model[$model_name]->components[$field_name]->simple_check($value);
+							
+								$arr_to_glued[]=$field_select.' '.$op.' \''.$value.'\'';
+							
+							break;
+							
+							case '!=':
+								
+								$value=Webmodel::$model[$model_name]->components[$field_name]->simple_check($value);
+								
+								$arr_to_glued[]=$field_select.' '.$op.' \''.$value.'\'';
+							
+							break;
+							
+							case 'LIKE':
+							
+								$value=Webmodel::$model[$model_name]->components[$field_name]->simple_check($value);
+							
+								$arr_to_glued[]=$field_select.' '.$op.' \''.$value.'\'';
+							
+							break;
+							
+							case 'IN':
+							case 'NOT IN':
+							
+								foreach($value as $key_val => $val)
+								{
+								
+									$value[$key_val]=Webmodel::$model[$model_name]->components[$field_name]->check($val);
+								
+								}
+								
+								$arr_to_glued[]=$field_select.' '.$op.' (\''.implode('\',\'', $value).'\')';
+							
+							break;
+						
+						}
+						
+					}
+				
+				}
+				
+				$arr_define_sql[$glue]=' '.implode(' '.$glue.' ', $arr_to_glued).' ';
+				
+				$arr_to_glued=array();
+			
+			}
+			
+			$arr_group=explode('_', $group);
+			
+			$separator_group=end($arr_group);
+			
+			if($first_sep==0)
+			{
+			
+				$separator_group='AND';
+			
+			}
+			
+			$first_sep++;
+			
+			$arr_final_sql[]=$separator_group.' ( '.implode(' '.$glue.' ', $arr_define_sql).' ) ';
+			
+			//$arr_define_sql=array();
+		
+		}
+		
+		$this->initial_sql.=implode('', $arr_final_sql);
+		
+		return $this->initial_sql;
+	
+	}
+	
+	public function get_order_sql()
+	{
+	
+		$arr_order_final=array();
+		
+		$final_order='';
+		
+		//$order_by[]=array('field' => 'moderator', 'order' => 'ASC'
+		
+		if(count($this->order_by)>0)
+		{
+			foreach($this->order_by as $arr_order)
+			{
+			
+				list($field_select, $model_name, $field_name)=$this->set_safe_name_field(Webmodel::$model[$this->model_name], $arr_order['field']);
+			
+				$arr_order_final[]=$field_name.' '.$arr_order['order'];
+			
+			}
+		
+			$final_order=' ORDER BY '.implode(' ,', $arr_order_final);
+		
+		}
+		
+		return $final_order;
+	
+	}
+	
+	public function get_limit_sql()
+	{
+			
+		if(count($this->limit)>0)
+		{
+		
+			return ' LIMIT '.implode(' ,', $this->limit);
+		
+		}
+		
+		return '';
+	
+	}
+	
+	public function get_all_sql()
+	{
+	
+		return $this->get_where_sql().$this->get_order_sql().$this->get_limit_sql();
+	
+	}
+	
+	public function set_safe_name_field($class, $field)
+	{
+		
+		$pos_dot=strpos($field, '.');
+		
+		$model_name='';
+		$field_name='';
+		
+		if($pos_dot!==false)
+		{
+		
+			//The model need to be loading previously.
+			
+			//substr ( string $string , int $start [, int $length ] )
+			
+			$model_name=substr($field, 0, $pos_dot);
+			$field_name=substr($field, $pos_dot+1);
+			
+			$field_select='`'.$model_name.'`.`'.$field_name.'`';
+		
+		}
+		else
+		{
+			
+			$model_name=$class->name;
+			$field_name=$field;
+			
+			$field_select='`'.$class->name.'`.`'.$field.'`';
+			
+		}
+		
+		return array($field_select, $model_name, $field_name);
+
+	}
+
+}
+