/* $dataArray = Array(
  *                 "Column1" => "value1",
  *                 "Column2" => "value2",
  *                 and so on...);
  */
    foreach ($dataArray as $row => $value)
    {
// $value[$PrimaryKey]  >>> where condition
// $PrimaryKey          >>> name of the column
// $Table               >>> table name
        if($this->m_myModel->verifyRow($value[$PrimaryKey], $PrimaryKey, $Table))
        {
            $newArray[] = $value;
            unset($dataArray[$row]);
        }// if
    }// foreach

function verifyRow($where, $select, $table)
{

    //$this->db->query("SELECT $select FROM $table WHERE $select = $where LIMIT 1");
    $this->db->select($select)
        ->from($table)
        ->where($select, $where)
        ->limit(1);

    $query = $this->db->get();

    if(isset($query->result()[0])) // This is where the error occurs
        return true;
    else
        return false;
}// function verifyRow

if($query->num_rows() > 0)
        return true;
    else
        return false;

$query = $this->db->get();
$result = $query->result(); # added

if(!empty($result))
    return true;
else
{
    return false;
}

foreach ($result as $value) {
    echo $value['field_name'];
}

$name = $result[0]['field_name'];
echo $name;