php - 具有动态生成名称的 Wordpress 瞬态作为函数中的参数

Question

希望你能帮助我解决这个问题：

我在简码函数中有几个不同帖子类型的查询。现在我正在尝试将这些查询与瞬态一起存储。但是这些瞬态需要为调用短代码的每个页面都有一个唯一的名称。

$trans_posts_golfcourse_ = 'trans_posts_golfcourse_'.$landingpage;

if( false === ( $$trans_posts_golfcourse_ = get_transient( 'trans_posts_golfcourse_' ) ) ) {

    $args = array (
        'posts_per_page'=> 5,
        'post__in'      => $posts_golfcourse,
        'post_type'     => 'golfcourse',
        'post_status'   => 'publish',
        'cache_results' => false,
    );

    $$trans_posts_golfcourse_ = new WP_Query( $args );

    set_transient( 'trans_posts_golfcourse_', $$trans_posts_golfcourse_, 60*60*4 );
}

动态生成的变量名是

$$trans_posts_golfcourse_

但是，这必须如何作为参数？：

get_transient( 'trans_posts_golfcourse_' )

提前致谢！

编辑：找到动态变量作为参数 的解决方案参数（字符串）必须以与变量名称相同的方式生成：

 get_transient( 'trans_posts_golfcourse_'.$landingpage )

完整代码：

$trans_posts_golfcourse_ = 'trans_posts_golfcourse_'.$landingpage;
if( false === ( ${$trans_posts_golfcourse_} = get_transient( 'trans_posts_golfcourse_'.$landingpage ) ) ) {

    $args = array (
        'posts_per_page'=> 5,
        'post__in'      => $posts_golfcourse,
        'post_type'     => 'golfcourse',
        'post_status'   => 'publish',
        'cache_results' => false,
    );

    ${$trans_posts_golfcourse_} = new WP_Query( $args );

    set_transient( 'trans_posts_golfcourse_'.$landingpage, ${$trans_posts_golfcourse_}, 60*60*4 );
}

编辑：瞬态并没有减少查询，尽管瞬态似乎被正确调用。有人有想法吗？

Answer 1

解决方案是将查询和循环放在瞬态中。有两种方法：

1. 在函数内部（简码 fe）

       function get_content( $dynamic_var ){
           $transient_time = 60*60*4;
           $transient_name = "transient_name_" . $dynamic_var;
   
           $content = get_transient( $transient_key );
           if( !empty($content)  ) { return $content; }
   
           $args = array ('');
           $query = new WP_Query( $args );
   
           $content = '';
           if( $query->have_posts() ):
               while( $query->have_posts() ) : $query->the_post();
                   $content.= 'some_content';
               endwhile; wp_reset_postdata();
           endif;
   
           set_transient( $transient_name, $content, $transient_time );
           return $content;
       }
   

2. 模板内部

           $transient_time = 60*60*4;
           $transient_name = 'transient_name_' . $page_id;
           // ${$transient_name} > name of variable is dynamically created by
           // the value of variable $transient_name (search for > php variable variables)
   
           $content = '';
           if( false === ( ${$transient_name} = get_transient( $transient_name ) ) ) {
               $args = array ('');
               $query = new WP_Query( $args );
   
               $content_inner = '';
               if( $query->have_posts() ):
                   while( $query->have_posts() ) : $query->the_post();
                       $content_inner.= 'some_content';
                   endwhile; wp_reset_postdata();
               endif;
   
               set_transient( $content_inner, ${$transient_name}, $transient_time );
           }
           $content.= ${$transient_name};