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I understand that Transients API is used to cache data and should be intended to store data that is expected to expire.

However, please clarify the following.

Can set_transient() be used to store data in multi-site scenario? If yes, how is it different from using set_site_transient() function?

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As the Codex suggests:

Essentially the same as set_transient() but works network wide when using WP Multisite.

One difference is that the transient name should be 40 characters or less in length. Also, while set_transient() sets transients that have an expiration time to not autoload, all transients added with set_site_transient will auto-load at all times.

In other words, the fundamental difference is in the auto-loading and since transients might be serialized, you could risk breakign things if referring to a blog (in MU) which has different settings/url/etc.

So the short answer is:

  • use set_transient for single blogs

  • use set_site_transient when you need something for ALL blogs.

Eg. of stored transients:

enter image description here

  • From your answer, I understand the following. 1. We can use set_transient for multisite 2. If we have blog specific data to be stored in cache, then it is better to use set_site_transient. Could you let me know if I get it right? – Maria Daniel Deepak Aug 29 '16 at 15:57
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    1. Yes, you can use it with WP MU. 2. If for blog you mean the whole WP Multisite, then yes. set_site_transient is meant to work on a more global level, while set_transient on a single blog level. – The J Aug 29 '16 at 16:01

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