Online PHP editor | refs for ZRAGA

<?php $students = [ ["name" => "a", "gender" => "male"], ["name" => "b", "gender" => "female"], ["name" => "c", "gender" => "female"], ["name" => "d", "gender" => "female"], ["name" => "e", "gender" => "male"], ["name" => "f", "gender" => "male"], ["name" => "g", "gender" => "male"], ]; $grouped = ['male' => [], 'female' => []]; foreach ($students as $student) { $grouped[$student["gender"]][] = $student; } var_export( array_merge( ...array_map( fn($m, $f) => [$m ?? [], $f ?? []], $grouped['male'], $grouped['female'] ) ) );