php rekursiv funktion behöver hjälp

id                      parent_id name
59	10	3	58	Team Luleå
82	10	4	59	tester
83	10	4	59	tester2
84	10	5	82	tester 3

        foreach ($ug->GetSiteMappingArray() as $mapping){
            array_push($objUserSiteMaps,$mapping);
            _p( "(" . $mapping->Id . ")" . $mapping->Name); echo "<br>";
            $arrNodes = getChildMapIds($mapping->Id,array($mapping->Id));
            
            print_r ($arrNodes); echo "<br>";
        }

function getChildMapIds($mapId,$value = array()){
        //söker i trädet och returnerar en array av alla noder vars förälder är $mapId
        $objSiteMapChildren = SiteMapping::QueryArray(QQ::AndCondition(qq::Equal(QQN::SiteMapping()->ParentId,$mapId)));
        foreach($objSiteMapChildren as $child){
        
            echo "found child for [".$mapId."]->child[".$child->Id."]<br>";         
            echo "adding child[".$child->Id."] to array<br>";
            array_push($value,$child->Id);
            //if(!empty($objSiteMapChildren)){
            getChildMapIds($child->Id,$value);
            //}
        }
        return $value; 
    }

USERGROUP id:1 :AF - Luleå
(59)Team Luleå
found child for [59]->child[82]
adding child[82] to array
found child for [82]->child[84]                 <- här hittas 84
adding child[84] to array
found child for [59]->child[83]
adding child[83] to array

Array ( [0] => 59 [1] => 82 [2] => 83 )     <-WTF? varför kommer inte 84 med?

USERGROUP id:2 :AF - Umeå
(60)Team Umeå
Array ( [0] => 60 )
USERGROUP id:3 :AF - Östersund
(61)Team Östersund
Array ( [0] => 61 )
USERGROUP id:4 :AF - Falun
(62)Team Falun
Array ( [0] => 62 )
USERGROUP id:5 :AF - Karlstad
(63)Team Karlstad
Array ( [0] => 63 )
USERGROUP id:6 :AF - Stockholm
(64)Team Stockholm
Array ( [0] => 64 )
USERGROUP id:7 :AF - Göteborg
(65)Team Göteborg
Array ( [0] => 65 )
USERGROUP id:8 :AF - Växjö
(66)Team Växjö
Array ( [0] => 66 )
USERGROUP id:9 :AF - Malmö
(67)Team Malmö
Array ( [0] => 67 )

function getChildMapIds($mapId,$value = array()){ //istället ange här &$value som du föreslog
    
        $objSiteMapChildren = SiteMapping::QueryArray(QQ::AndCondition(qq::Equal(QQN::SiteMapping()->ParentId,$mapId)));
        foreach($objSiteMapChildren as $child){
            
            echo "found child for [".$mapId."]->child[".$child->Id."]<br>";
            //array_push($arrayNodes,$child->Id);
            echo "adding child[".$child->Id."] to array<br>";
            array_push($value,$child->Id);
            
            getChildMapIds($child->Id,&$value); // är det fel? fast jag får rätt returvärden nu    
        }
        return $value; 
    }