树形数组的递归遍历

include_once ("inc/auth.inc.php");

function tree($parentid = 0) {
 /*获取递归的数据*/
 $sql = "select * from file_sort where sort_parent = $parentid";
 $sql1="select * from file_sort where sort_parent = $parentid order by sort_no asc";
 if($parentid ==0){
  $rs = mysql_query ( $sql,TD::conn() );
 }else{
  $rs = mysql_query ( $sql1,TD::conn() );
 } 
 
 echo ("

");
 while ( $ra = mysql_fetch_row ( $rs ) ) {  /* 循环输出是树节点 */
  ?>
     echo ('
' . $ra [0] . '
');
  ?>
 
 
  
  
  /* 递归调用 -循环输出子节点*/
  tree ( $ra [1] );
 }
 echo ("

");
}
tree ();
?>