อยากได้โค้ดการแบ่งหน้าโดยแสดงแถวล่ะ4คอลัม และถ้ารหัสสินค้ามี5ตัวให้รหัสต่อไปขึ้นแถวใหม่

<?php

	echo 'multi column plus category go to new line algorithm<br>';
	$codes = array(101,102,103,104,105,201,202,203,204,301,302,303,304);
	$prefix = '';//last first char
	$i = 0;
	while($n = array_shift($codes)){
		$f = substr((string)$n,0,1);//first char =1,2,3..
		if ($f != $prefix){//new first char (new category)
			if (!empty($prefix))//is not first category (2,3,...)
				echo '<br>';
			$prefix = $f;//set prefix to be first char of new category
			$i=0;//reset column control
		}
		if ($i % 4 == 0 && $i != 0)//is first column but is not first of new category
			echo '<br>';
		echo $n.' ';//echo data
		$i++; //increase column control
	}

?>

<?php

$sql="SELECT * FROM picture_table ORDER BY id DESC";
$result=mysql_query($sql);
$row=mysql_fetch_array($result);
$lastid=$row['id'];
$prefix=substr($lastid,0,5);

// echo $prefix; //JA-545

echo "<table width=\"100%\" cellspacing=10 cellpadding=10 border=1>";

$i=1;

while ($row=mysql_fetch_array($result))   {
$id=$row['id'];	
$thisprefix=substr($id,0,5);

$picture_name=$row['picture_name'];	

                if ($prefix!=$thisprefix) {echo "<tr>"; $i=1;}    
                echo "<td align=center>";

                echo "<a href=path/$picture_name><img src=path/$picture_name></a> <br>$picturetpye_name<br>$id";
                                
                echo "</td>";

                        if ($i%4==0 && $prefix==$thisprefix) {echo "</tr>";}
                        
                $i++;
                $prefix=$thisprefix; 

            } 
                echo "</table>";
?>