<?php 

Class InterestInvoices{
    public $document_list;
    public $db;
    public $ask;
    public $res;
    public $result;
    public $reply;
    
    public function searchInterestInvoices(){
        $this->db=$GLOBALS['db'];
        $this->ask="SELECT * FROM ecmtransactions 
                WHERE deleted='0' AND 
                record_type='EcmInvoiceOuts' 
                AND type='0' 
                AND register_date > '2011-12-31'
                AND (settled='0' OR settled IS NULL) and payment_date < '".date("Y-m-d")."'
                ORDER BY payment_date desc";
        $this->reply=$this->db->query($this->ask);
        while($this->result=$this->db->fetchByAssoc($this->reply)){
            $this->document_list[]=$this->result;
        }
        var_dump($this->document_list);
    }
}

$c=new InterestInvoices();
$c->searchInterestInvoices();