What is the very earliest action hook you can call?

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muplugins_loaded is the earliest hook.

Depending on your wordpress setup, you may not have any plugins in the MU_PLUGINS directory. In that case this hook may not fire.

The next best hook to trigger is plugins_loaded.

RESOURCES

  1. WordPress Codex – Action Reference List
  2. Q/A: How to get WordPress’ hook run sequence?
  3. Q/A: Make sense of WP Load Core

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