problem in counting children category

I have this table:

fourn_category (id , sub)

I am using this code to count:

function CountSub($id){
$root =开发者_开发知识库 array($id);
 $query = mysql_query("SELECT id FROM fourn_category WHERE sub = '$id'");                                            

    while( $row = mysql_fetch_array( $query, MYSQL_ASSOC ) ){

        array_push($root,$row['id']);
       CountSub($row['id']);
    }        

    return implode(",",$root);  
}

It returns the category id as 1,2,3,4,5 to using it to count the sub by IN()

But the problem is that it counts this:

category 1 > category 2 > category 3 > category 4 > category 5

Category 1 has 1 child not 4. Why? How can I get all children's trees?

From what I understand, I suspect that you have a scope issue in your code. Try :

function CountSub($id, &$current=array()){
    array_push($current, $id);
    $query = mysql_query("SELECT id FROM fourn_category WHERE sub = '$id'");                                            

    while( $row = mysql_fetch_array( $query, MYSQL_ASSOC ) ){
        CountSub($row['id'], $current);
    }        

    return implode(",",$current);  
}

CountSub(1)

In your code, a new $root array is created at each level of the recursive function and the recursive calls never modify the original created array, which may be your problem

I Hope this will help Jerome