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From Codex
Action Reference
:
init
Runs after WordPress has finished loading but before any headers are sent. Useful for intercepting $_GET or $_POST triggers.
wp_head
Runs when the template calls the wp_head function. This hook is generally placed near the top of a page template between
and
. This hook doest take any parameters.
Basically
wp_head
runs when page is already being loaded, while
init
runs before that.
Also don forget that
init
fires on admin pages as well and anything front-end related must be excluded from there with
!is_admin()
check.
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