wp_cache_set和wp_cache_get
wp_cache_set( , , = '', = 0 ->set( , , , (int)
wp_cache_get( , = '', = , & = ->get( , , ,
=->ID,,'related_posts',3600);
= wp_cache_get(->ID,'related_posts'( === =->ID,,'related_posts',3600 ;
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