Create asymmetric tree array without recursion, good for cat

Create asymmetric tree array without recursion, good for categories with unlimited childs

<?php
$arr = array(
    array(
        'id' => 1,
        'cat' => 'cat1',
        'parinte' => null,
    ),

    array(
        'id' => 2,
        'cat' => 'cat2',
        'parinte' => 1,
    ),


      array(
        'id' => 3,
        'cat' => 'cat3',
        'parinte' => 2,
    ),

      array(
        'id' => 4,
        'cat' => 'cat4',
        'parinte' => 2,
    ),

      array(
        'id' => 5,
        'cat' => 'cat5',
        'parinte' => 4,
    ),

      array(
        'id' => 6,
        'cat' => 'cat6',
        'parinte' => 5,
    ),


       array(
        'id' => 7,
        'cat' => 'cat7',
        'parinte' => null,
    ),


      array(
        'id' => 8,
        'cat' => 'cat8',
        'parinte' => 7,
    ),


      array(
        'id' => 9,
        'cat' => 'cat9',
        'parinte' => 6,
    ),

      array(
        'id' => 10,
        'cat' => 'cat10',
        'parinte' => 9,
    ),

      array(
        'id' => 11,
        'cat' => 'cat10',
        'parinte' => 4,
    ),


       array(
        'id' => 12,
        'cat' => 'cat12',
        'parinte' => 8,
    ),


      array(
        'id' => 13,
        'cat' => 'cat13',
        'parinte' => 12,
    ),

  );


$arrFin = array();

$syntax = '';
foreach($arr as $r) {

    $name = 'syn' . $r['id'];
    $parentName = 'syn' . $r['parinte'];
    @$$name = $$parentName . ',' . $r['id'];

    //echo @$$name . "\n";

    if(!$r['parinte']) {
        $arrFin[$r['id']] = $r;
        $arrFin[$r['id']]['copii'] = array();


    }
    else {
        if( isset($arrFin[ $r['parinte'] ]) ) {
            $arrFin[$r['parinte']]['copii'][$r['id']] = $r;
            $arrFin[$r['parinte']]['copii'][$r['id']]['copii'] = array();

        }
        else {
            $newName = 'syn' . $r['parinte'];

            $traces = explode(',', $$newName);


            $elm = $r;
            $elm['copii'] = array();

            $arrSyntax = '['.implode('][\'copii\'][', $traces) . '][\'copii\']';
            $arrSyntax = substr($arrSyntax, 11);
            $phpSyntax = '$arrFin'.$arrSyntax.'[$elm[\'id\']] = $elm;';

            echo $arrSyntax . "\n";


            eval($phpSyntax);
        }
    }



}

print_r($arrFin); exit;