Nyobain

coba_omarsaeda_1.php

<?php
$array = array (
	'foo',
	'bar',
	'baz'
);
$hasil = array();
$count = count($array);
for ($i = 0; $i < $count; $i++)
    $hasil=[$array[$count-$i-1]=>$hasil];


// buat liat hasilnya
echo json_encode($hasil, JSON_PRETTY_PRINT);