public function __isset($strKey)
	{
		if (empty($this->arrCache))
		{
			$this->next();
		}

		return isset($this->arrCache[$strKey]);
	}
public function __isset($strKey)
	{
		if (empty($this->arrCache))
		{
			$this->next();
		}

		return isset($this->arrCache[$strKey]);
	}
public function __isset ( $ strKey ) { if ( empty ( $ this -> arrCache ) ) { $ this -> next ( ) ; } return isset ( $ this -> arrCache [ $ strKey ] ) ; }
Check whether a field exists

@param mixed $strKey The field name

@return boolean True if the field exists
Check whether a field exists