i tried to include basic functions for connect, execute queries, fetch rows... in classes.

whenver i execute on of the fetch functions : first time it works fine, the next call to fetchrow generates gpe.

$GolbalConnection=null;
class connection
	{
	function connection($Server,$UserName,$Password,$db)
		{
		global $GolbalConnection;
		$GolbalConnection=odbc_connect($Server,$UserName,$Password);
		}
	function getc()
		{
		return $GolbalConnection;
		}
	};
class recordset
	{
	var $res;
	function getr()
		{
		return $this->$res;
		}
	function open($q)
		{
		global $GolbalConnection;
		//settype($this->$row,"array");
		$this->$res=odbc_exec($GolbalConnection,$q);
		if(!$this->$res)
			$this->$res=0;

		return $this->$res;
		}
	function fetchrow($r=0)
		{
		static $row;

		if($this->$res!=0)
			{
			if($r>0)
				{
				$t=odbc_fetch_row($this->$res,$r);
				}
			else
				{
				$t=odbc_fetch_row($this->$res);
				}
			}
		if(!$t) 
			$row=null;
		else
			{
			$row=null;
			for($i=0;$i<odbc_num_fields($this->$res);$i++)
				{
				$nm=odbc_field_name($this->$res,$i+1);
				$row[$nm]=odbc_result($this->$res,$nm);
				}
			}
		return $row;
		}
	};