public static function is_post_page($use_post = false)
{
if (self::$is_post_ret !== null) {
return self::$is_post_ret;
} elseif (is_singular() || $use_post !== false) {
return self::$is_post_ret = true;
} elseif (is_admin()) {
$screen_id = self::get_screen_id();
// exclude post/page/media editing lists
if (strpos($screen_id, 'edit-') !== false || $screen_id === 'upload') {
return self::$is_post_ret = false;
} elseif (self::get_req_val('post_ID', 'POST') !== '' || self::get_req_val('post', 'GET') !== '') {
return self::$is_post_ret = true;
}
}
return self::$is_post_ret = false;
}