1週間以内の投稿だけを表示させる if文を使用する

function post_data_in_a_week($post_data) {
  $post_data_in_a_week = [];
  foreach ($post_data as $post) {
    if (strtotime($post['created_at']) > strtotime('-1 week')) {
      $post_data_in_a_week[] = $post;
    }
  }
  return $post_data_in_a_week;
}