Online PHP editor | refs for PPXul

<?php $array = [ [ 'id' => 67941, 'parent_id' => 0, 'name' => 'Requirement', 'children' => [ [ 'id' => 67942, 'parent_id' => 67941, 'name' => 'Sub Requirement', 'children' => [ [ 'id' => 67943, 'parent_id' => 67942, 'name' => 'Sub Sub Requirement', ], ], ], ], ], [ 'id' => 67977, 'parent_id' => 0, 'name' => 'Requirement', 'children' => [ [ 'id' => 67978, 'parent_id' => 67977, 'name' => 'Sub Requirement', 'children' => [ [ 'id' => 67979, 'parent_id' => 67978, 'name' => 'Sub Sub Requirement', 'children' => [ [ 'id' => 67980, 'parent_id' => 67979, 'name' => 'Sub Sub Sub Requirement', ], ], ], ], ], ], ], ]; $needle = 67943; $ritit = new RecursiveIteratorIterator(new RecursiveArrayIterator($array)); $result = null; foreach ($ritit as $leafValue) { $path = []; foreach (range(0, $ritit->getDepth()) as $depth) { $obj = $ritit->getSubIterator($depth); $key = $obj->key(); if ($key !== 'children') { $path[] = $key; } if ($obj->current() === $needle) { $result = $path; break 2; } } } var_export($result);