Can set_transient() be used in multi-site?
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. … Read more