[ Posted by Victor Lopez ] Tree sample

fiddle_049216.php

<?php

$n0000 = ['{id:A0}','COGTO - CLASIFICADOR OBJETO DEL GASTO',null,null];
$n0001 = ['{id:A1}','10000 - SERVICIOS PERSONALES', null, null];
$n0011 = ['{id:A11}','11000 - REMUNERACIONES AL PERSONAL DE TRABAJO PERMANENTE',null, null];
$n0111 = ['{id:A111}','11100 - DIETAS', null, null, '{format:{expanded:true}'];
$n1111 = ['{id:A1111}', '11101 - DIETAS', 'https://www.google.com', 'mainFrame'];
$n1112 = ['{id:A1112}', 'Level 3, Item 2', 'https://www.fast.com', null];

$arrFin = [];
for($x=0; $x<=3; $x++){
    $n = 'NIVEL'.$x;
    $comp[]=$n;
    $comp[]=null;
    $comp[]=null;
    //$cap=[];
    $ii=-1;
    for($y=0; $y<=1; $y++){
        $m = 'DENTRO'.$y;
        $ii++;
        $cap[] = $m;
        $cap[] = null;
        $cap[] = null;
//        $filas = [];
//        $zz=-1;
//        for($z=0; $z<=1; $z++){
//            $o = 'MAAAS'.$z;
//            $zz++;
//            $filas[$zz]=$o;
//        }
//        $cap[$ii]=$filas;
    }
    $comp[]=$cap;
}
array_push($arrFin,$comp);

print_r($arrFin);
print_r('<br><br>');
$fin = json_encode($arrFin);
print_r($fin);

?>