pulgin custom hook Or call function defined in function.php from plugin
in plugin:
…
add_action('after_setup_theme',function(){ if(function_exists('the_action_callback')) { do_action('the_action_hook'); } });
…
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function.php
add_action('the_action_hook', 'the_action_callback'); function the_action_callback() { echo '<p>Hi I am from function.php</p>'; }