WordPress のカスタムフィールドを用いた簡易的なキャッシュ実装コード

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class wbCache
{
 public function get_cache($post_id, $key, $cachetime)
 {
 $timestamp_now = time();
 $timestamp = get_post_meta($post_id, $key . '_time', true);
 if($timestamp == '')
 $timestamp = time();
 $timestamp_add = $timestamp_now - $timestamp - $cachetime;
 if($timestamp_add > 0) {
 $value = false;
 } else {
 $value = get_post_meta($post_id, $key, true);
 }
 return $value;
 }
 
 public function save_cache($post_id, $key, $value)
 {
 update_post_meta($post_id, $key, $value);
 update_post_meta($post_id, $key . '_time', time());
 }
}

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$data = wbCache::get_cache($post->ID, 'hoge', 3600*24);
if($data === false) {
 $data = '新しくデータを取得した。';
 wbCache::save_cache($post->ID, 'hoge', $data);
}
echo $data;