function getCategoriesArray($parent_id ='NULL', ....

    function getAllSubCategories($parent_id) {

        $result = mysql_query("SELECT * FROM categories WHERE parentid" . ($parent_id == 'NULL' ? ' is ' : '=') . $parent_id);

        return $result;

    }

 <?php

class Categories{

 function getCategoriesArray($parent_id = 0, $padding=0, $prefix="&raquo;"){

 $return = array();

 $return = $this->getSubCategoriesArray($parent_id, $padding, $prefix);

 return $return;

 }

 function getSubCategoriesArray($parent_id, $padding, $prefix){

 static $i=0;

 $resource = $this->getAllSubCategories($parent_id);

 static $return = array();

 if (@is_resource($resource)){

 while ($records_array = mysql_fetch_assoc($resource)) {

 $return['id'][$i] = $records_array['id'];

 if(is_int($padding)){

 $return['name'][$i] = "<div style='padding-left:".$padding."px'>".$prefix ." &nbsp;".$records_array['name']."</div>";

 }else{

 $return['name'][$i] = $padding. $prefix .$records_array['name'];

 }

 $i++;

 if(is_int($padding)){

 $this->getSubCategoriesArray($records_array['id'], ($padding+15), $prefix);

 }else{

 static $pad ="";

 if($pad == ""){

 $pad = $padding;

 }

 $this->getSubCategoriesArray($records_array['id'], $padding.$pad, $prefix);

 }

 }

 }

 return $return;

 }

 function getAllSubCategories($parent_id=0) {

 $result = mysql_query("SELECT * FROM categories WHERE parentid='" . $parent_id . "'");

 return $result;

 }



 //when disabling the parent category its all subcategory should be disabled.

 function changeAllSubCategoriesStatus($id, $status)

 {

 static $subcat = array();

 $subcat[] = $id;

 $result = mysql_query("UPDATE categories set status=$status WHERE id = $id");

 $select_result = mysql_query("SELECT id FROM categories WHERE parentid=$id");

 $hasSubcat = mysql_result($select_result, 0, 0);

 if($hasSubcat){

 $this->changeAllSubCategoriesStatus($hasSubcat, $status);

 }

 return $subcat;

 }



 //when enabling the subcategory its all parent category should be enabled.

 function changeAllParentCategoriesStatus($id, $status)

 {

 static $parentcat = array();

 $parentcat[] = $id;

 $result = mysql_query("UPDATE categories set status=$status WHERE id = $id");

 $select_result = mysql_query("SELECT parentid FROM categories WHERE id=$id");

 $hasParentcat = mysql_result($select_result, 0, 0);

 if($hasParentcat){

 $this->changeAllParentCategoriesStatus($hasParentcat, $status);

 }

 return $parentcat;

 }



 //if you know the level of category then you use this other wise dont use this

 function getCategoriesInTreeStructure($level = 10){

 $query = " SELECT node0.name AS node0_name, node0.status as node0_status,node0.parentid as node0_parent, node0.id as node0_id";



 //select nodes

 for($l=1;$l<=$level;$l++) {

 $query .=     ",node".$l.".name AS node".$l."_name, node".$l.".status as node".$l."_status,node".$l.".parentid as node".$l."_parent, node".$l.".id as node".$l."_id ";

 }

 //join

 $query .= " FROM categories AS node0 ";

 for($l=1;$l<=$level;$l++) {

 $query .= " LEFT OUTER JOIN categories AS node".$l." ON node".$l.".parentid = node".($l-1).".id";

 }

 //conditions

 $query .= " WHERE ((node0.parentid IS NULL) OR (node0.parentid =0)) ORDER BY node0_name ";

 for($l=1;$l<=$level;$l++) {

 $query .= ",node".$l."_name ";

 }

 $resource = mysql_query($query);

 return $resource;

 }

}



$connect = mysql_connect("localhost", "user", "password");

$dh = mysql_select_db("database", $connect);

$cat_obj = new Categories();

$cat_array =$cat_obj->getCategoriesArray();



//For dropdowns

//$cat_array = $cat_obj->getCategoriesArray(0, "--", "");



foreach($cat_array['name'] as $key =>$catname) {

 //id---->echo $cat_array['id'][$key];

 echo $catname;

}



?>

SELECT @poradi := @poradi + 1 AS poradi, jmeno, pocet FROM (SELECT @poradi := 0) p, body ORDER BY 1;

SELECT (select count(*) from body b where b.pocet > body.pocet) + 1 AS poradi, jmeno, pocet FROM body ORDER BY 1;

select a.zavodnik,
  (select count(*) from tabulka b)  - (select count(*) from tabulka c
                where c.body<a.body) poradi
  from tabulka a
order by 1  desc