php: loop

gistfile1

<?php 
$tags = array();
while($row = mysqli_fetch_array($result))
  {
$row =  $row['tags'];
$array = explode(',', $row);

foreach($array as $val) {
	array_push($tags, $val);
}
 } 

$tags = array_filter(array_unique($tags))	;
foreach($tags as $val) {
	echo '<li><a href="?tag='.$val.'">'. $val . '</a></li>';
}
 ?>