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<?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'] ) ) );
Output for git.master, git.master_jit
array ( 0 => array ( 'name' => 'a', 'gender' => 'male', ), 1 => array ( 'name' => 'b', 'gender' => 'female', ), 2 => array ( 'name' => 'e', 'gender' => 'male', ), 3 => array ( 'name' => 'c', 'gender' => 'female', ), 4 => array ( 'name' => 'f', 'gender' => 'male', ), 5 => array ( 'name' => 'd', 'gender' => 'female', ), 6 => array ( 'name' => 'g', 'gender' => 'male', ), 7 => array ( ), )

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