which action to hook to in order to perform post-publish action

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I have some functionality I’ve written in order to post the title and link for the post to twitter whenever a post is published.

I’m wondering which wp function to hook this to? save_post has no real reference documentation. Basically I just want to run an action when a post is successfully published.

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Thanks very much.

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  1. You could hook into publish_post like the plugin Inform about Content does.

    But this hook is fired on updates to published posts too, this may result in many redundant tweets …

    Try 'draft_to_publish' instead. It is called in wp_transition_post_status() and happens only one time. You get the $post object as argument.

    Prototype, not tested:

    add_action( 'draft_to_publish', 'wpse_55516_tweet_new_post' );

function wpse_55516_tweet_new_post( $post )
{
    if ( 'post' !== $post->post_type )
    {
        return;
    }

    // Tweet it like a boss …
}