src/Data/DataSet.php
public function get($key)
    {       
        if (isset($this->varValue[$key])) {
            return new DataRecord($this->varValue[$key], $this->bizDataObj);
        } else {
            return NULL;
        }        
    }
public function get($key)
    {       
        if (isset($this->varValue[$key])) {
            return new DataRecord($this->varValue[$key], $this->bizDataObj);
        } else {
            return NULL;
        }        
    }
Get item value of array

@param mixed $key
@return mixed