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What is the difference between DRUPAL_CACHE_PER_PAGE and DRUPAL_NO_CACHE?

I'm developing a module that will generate 2 blocks for menu and it's sub-menu in different blocks and can't decide between those two options for the blocks.

links: https://api.drupal.org/api/drupal/includes%21common.inc/constant/DRUPAL_NO_CACHE/7 https://api.drupal.org/api/drupal/includes%21common.inc/constant/DRUPAL_CACHE_PER_PAGE/7

  • Welcome to Drupal Answers! What don't you understand in "The block or element can change depending on the page being viewed"? – kiamlaluno Apr 19 '15 at 3:15
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  • DRUPAL_NO_CACHE doesn't cache the item, ever.
  • DRUPAL_CACHE_PER_PAGE caches the item per page url -- this is useful for example if the block changes with a url context.
  • What means caches the item per page url? – Incredible Apr 18 '15 at 23:53
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    It means that, if you visit twice a page like node/1 and the block is visibile on those pages, the second time the block will be rendered from the cache. – kiamlaluno Apr 19 '15 at 3:14
  • thanks, I think I could use DRUPAL_CACHE_PER_PAGE in this case – Incredible Apr 19 '15 at 8:47

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