<?php $arr = ['aaa', 'bbb', 'ccc', 'ddd']; $k = count($arr); $query = []; $parents = []; for ($i = 1; $i < $k; $i++) { for ($j = 0; $j < $k; $j++) { if ($j < $k - $i) { $query[$i][] = $arr[$j]; $parents[2 * $k - 1 - $j][] = $arr[$j]; } else { $query[2 * $k - 1 - $j][] = $arr[$j]; $parents[$i][] = $arr[$j]; } } } var_dump($query, $parents);
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Value for `_results` contains invalid data `array`