Online PHP editor | output for BREsW

<?php $arr = [ "elem-1" => ["title" => "1", "desc" => ""], "elem-2" => ["title" => "2", "desc" => ""], "elem-3" => ["title" => "3", "desc" => ""], "elem-4" => ["title" => "4", "desc" => ""], ]; $result = []; array_walk( $arr, function($row, $key) use(&$result) { $result[] = [$key => $row['title']]; } ); var_export($result); echo "\n---\n"; $result = []; foreach ($arr as $key => $row) { $result[] = [$key => $row['title']]; } var_export($result); echo "\n---\n"; var_export(array_chunk(array_map(fn($row) => $row['title'], $arr), 1, true));