ทำไมเขียนวน loop รับค่าจาก database แล้วปรากฎว่า ค่าออกมาซ้ำกัน ช่วยดู code ให้ด้วยนะคะ

  $sql = "select ID from ID order by No Asc";  
			   $query = mysql_query($sql) or die(mysql_error());
			   $num = mysql_num_rows($query);
			   $strFileName = "fromdb.txt";	
			   $objFopen = fopen($strFileName, 'w');
			 		   
		   If ($num >0) {
			   for($i=0;$i<$num;$i++)
			   {
				     	$row = mysql_fetch_array($query);
						$arr[] = $row['ID'];
                   		echo $arr[$i]; 
						?>
                        <br>
                        <?
						$sql1 = "select Date, $arr[$i] from Active order by Date Asc"; 
						$query1 = mysql_query($sql1) or die(mysql_error());
			   			$num1 = mysql_num_rows($query1);
						echo "$", $arr[$i], "= [";
						fputs($objFopen, "$");						
						fputs($objFopen, $arr[$i]);
						fputs($objFopen, "= [");
											
						for($b=0;$b<$num1;$b++)
						{
				
						$row1 = mysql_fetch_array($query1);
						$arr1[] =  $row1[$arr[$i]];
						$arr2[] =  $row1['Date'];
						$arr3="['";
						$arr3.= $arr2[$b];	
						$arr3.= "',";
						$arr3.= $arr1[$b];
						
						If ($b<$num1-1){ 
						$arr3.="],";
						}
						If ($b>=$num1-1){
						$arr3.="]];";	
						}
						//echo "[",$arr2[$b], ",", $arr1[$b], "]";
						echo $arr3;
						
						fputs($objFopen, $arr3);
						
						?>
    					<?	
						//echo $arr3;
						}
					//	fputs($objFopen, "]");
						
					?>
                    <br>   
                        <?	
						 fputs($objFopen, "\r\n");
				}
				
		   }
		   fclose($objFopen);