system/classes/Database.php
public function in($conditions, $value = false, $comparison = 'IN')
    {
        $val = $value;
        if (!is_array($value)) {
            $val = explode(',', $val);
        }
        $this->store('condition', 'wheres', $conditions, $val, $comparison);
        return $this;
    }
public function in($conditions, $value = false, $comparison = 'IN')
    {
        $val = $value;
        if (!is_array($value)) {
            $val = explode(',', $val);
        }
        $this->store('condition', 'wheres', $conditions, $val, $comparison);
        return $this;
    }
public function in($column, $fields)