i thought, that i understand what references do. but now i meet an example, which can't understand anyway.

i saw an interesting script here, but why he use & in this script i can't understand. here is the part of script

foreach ($nodeList as $nodeId => &$node) 
{
    if (!$node['id_parrent'] || !array_key_exists($node['id_parrent'], $nodeList)) 
    {
        $tree[] = &$node;
    } 
    else 
    {
        $nodeList[$node['id_parrent']]['children'][] =&$node;
    }
}

if he doesn't make any changes on $node, why it is needed to use references here? there is nothing like $node = any changes, so why use =& $node, instead $node?

belki anlamak için bana yardımcı olacak?

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