Res

<?php
    public final class Res()
    {
        const ARRAY = 1;
        const OBJECT = 0;

        private $dataType = null;

        public function setDataTypeIsArray()
        {
            $this->$dataType = self::ARRAY;
        }

        public function setDataTypeIsObject()
        {
            $this->$dataType = self::OBJECT;
        }

        public function setData()
        {
            if($this->$dataType === self::ARRAY)
            {
                // do something
            }
            else if($this->$dataType === self::OBJECT)
            {
                // do something
            }
        }
    }
?>