The Hybrid Hooks PlugIn is great for quickly testing something but once it is working then it is secure from accidental editing if it is transferred to functions.php. I added a <div class=”halo”></div> “before_content” to provide the halo around post elements. Once this was stable and signed off, I transferred it into functions.php very simply:
add_action( 'hybrid_before_content', 'halo_add_halo_div' ); function halo_add_halo_div() { echo '<div class="halo"></div>'; }
Then the entry on the Hybrid Hooks PlugIn screen can be deleted. Job done.