Creating an array using recursive php from mysql

Question

I need to create an array from a mysql database organized like so

id    description    parentId    
1      Level 1        0           
2      Level 2                 


        

Answer 1

It would probably be easiest if you created an array that mapped from id to object as you create your objects so you can easily lookup nested objects. Basically:

$tree = array();
$lookup = array();

while($row = mysql_fetch_assoc($result))  
{
    $object = array('id' => $row['id'],        
                    'description' => $row['description'],        
                    'parentId' => $row['parentId']);

    $lookup[$row['id']] = $object;

    $parentId = $row['parentId'];
    if ($parentId == 0)
    {
        $tree[] = $object;
    }
    else
    {
        $lookup[$parentId]['Children'][] = $object;
    }
}