Tableau Switch

resultat.txt

array(2) {
  ["RG1"]=>
  array(2) {
    [1]=>
    array(4) {
      ["UNITE"]=>
      string(2) "U1"
      ["IP"]=>
      string(11) "10.118.6.30"
      ["NOM"]=>
      string(15) "rca0180007ksw30"
      ["PARENT"]=>
      string(16) "rca0180007ksw126"
    }
    [2]=>
    array(4) {
      ["UNITE"]=>
      string(2) "U2"
      ["IP"]=>
      string(11) "10.118.6.31"
      ["NOM"]=>
      string(15) "rca0180007ksw31"
      ["PARENT"]=>
      string(15) "rca0180007ksw30"
    }
  }
  ["RG3"]=>
  array(3) {
    [1]=>
    array(4) {
      ["UNITE"]=>
      string(2) "U1"
      ["IP"]=>
      string(11) "10.118.6.38"
      ["NOM"]=>
      string(15) "rca0180007ksw38"
      ["PARENT"]=>
      string(16) "rca0180007ksw126"
    }
    [2]=>
    array(4) {
      ["UNITE"]=>
      string(2) "U2"
      ["IP"]=>
      string(11) "10.118.6.39"
      ["NOM"]=>
      string(15) "rca0180007ksw39"
      ["PARENT"]=>
      string(15) "rca0180007ksw38"
    }
    [3]=>
    array(4) {
      ["UNITE"]=>
      string(2) "U3"
      ["IP"]=>
      string(12) "10.118.6.100"
      ["NOM"]=>
      string(16) "rca0180007ksw100"
      ["PARENT"]=>
      string(15) "rca0180007ksw39"
    }
  }
}

test.php

<?php

$coeur = 'rca0180007ksw126';

$parent = array(
    "RG1" => array(
        // L'index 1 n'est pas créé naturellement mais je fais un substring de l'unité dans la boucle qui precede ce tableau
        1 => array(
            "UNITE"=> "U1",
            "IP"=> "10.118.6.30",
            "NOM"=> "rca0180007ksw30"
        ),
        2 => array(
            "UNITE"=> "U2",
            "IP"=> "10.118.6.31",
            "NOM"=> "rca0180007ksw31"
        )
    ),
    "RG3"=> array(
        1 => array(
            "UNITE"=> "U1",
            "IP"=> "10.118.6.38",
            "NOM"=> "rca0180007ksw38"
        ),
        2 => array(
            "UNITE"=> "U2",
            "IP"=> "10.118.6.39",
            "NOM"=> "rca0180007ksw39"
        ),
        3 => array(
            "UNITE"=> "U3",
            "IP"=> "10.118.6.100",
            "NOM"=> "rca0180007ksw100"
        )
    )
);

foreach ($parent as $key => $value) {
    foreach ($value as $k => $v) {
        if ($v['UNITE'] == 'U1') {
            $parent[$key][$k]['PARENT'] = $coeur;
        }else{
            $unit = $k - 1;
            $parent[$key][$k]['PARENT'] = $parent[$key][$unit]['NOM'];
        }
    }
}

var_dump($parent);

?>

Le but c'est que pour chaque baie (RG1, RG3) le switch U1 a un champ parent que je choisi mais que le switch U2 est un champ parent correspondant au nom du U1 et pareil pour le switch U3 est un champ parent correspondant au nom de U2.

<?php
$parent = array(
    'RG1' => array(
        ID0000001 => array(
            'UNITE' => 'U1',
            'IP'    => '10.118.6.30',
            'NOM'   => 'rca0180007ksw30',
            'LINK'   => '----------TON_ID_ICI----------',
        ),
        ID0000002 => array(
            'UNITE' => 'U2',
            'IP'    => '10.118.6.31',
            'NOM'   => 'rca0180007ksw31',
            'LINK'  => 'ID0000001', // Le lien
        )
    ),
    'RG3'=> array(
        ID0000003 => array(
            'UNITE' => 'U1',
            'IP'    => '10.118.6.38',
            'NOM'   => 'rca0180007ksw38',
            'LINK'  => '----------TON_ID_ICI----------',
        ),
        ID0000004 => array(
            'UNITE' => 'U2',
            'IP'    => '10.118.6.39',
            'NOM'   => 'rca0180007ksw39',
            'LINK'  => 'ID0000003', // Le lien
        ),
        ID0000005 => array(
            'UNITE' => 'U3',
            'IP'    => '10.118.6.100',
            'NOM'   => 'rca0180007ksw100',
            'LINK'  => 'ID0000004', // Le lien
        )
    )
);

<?php

$parent = array(
    "RG1" => array(
        1 => array(
            "UNITE"=> "U1",
            "IP"=> "10.118.6.30",
            "NOM"=> "rca0180007ksw30"
            "PARENT"=>"rca0180007ksw126"
        ),
        2 => array(
            "UNITE"=> "U2",
            "IP"=> "10.118.6.31",
            "NOM"=> "rca0180007ksw31"
            "PARENT"=>"rca0180007ksw30"
        )
    ),
    "RG3"=> array(
        1 => array(
            "UNITE"=> "U1",
            "IP"=> "10.118.6.38",
            "NOM"=> "rca0180007ksw38"
            "PARENT"=>"rca0180007ksw126"

        ),
        2 => array(
            "UNITE"=> "U2",
            "IP"=> "10.118.6.39",
            "NOM"=> "rca0180007ksw39"
            "PARENT"=>"rca0180007ksw38"
        ),
        3 => array(
            "UNITE"=> "U3",
            "IP"=> "10.118.6.100",
            "NOM"=> "rca0180007ksw100"
            "PARENT"=>"rca0180007ksw39"
        )
    )
);

?>

Le resultat final c'est ça que je veux obtenir mon probleme c'est comment je fait le foreach pour arriver à ce resultat xD