$_POST = $this->db->mres($_POST);
$_SESSION['post'] = $_POST;

$sql = "SELECT id, documento, nombre1, nombre2, apellido1, apellido2 "
        . "FROM usuarios "
        . "WHERE " .
    "REPLACE(" .
        "REPLACE(" .
            "REPLACE(" .
                "REPLACE(telefono,' ','')," .
                "'(','')," .
            "')','')," .
        "'-','') LIKE '%{$searchTel}'";